Malicious PDF — malware analysis report

Static analysis result for SHA-256 678993df59b11d7b…

MALICIOUS

PDF

170.0 KB Created: 2021-07-06 01:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d402140abf69c299df36c3c2b7a19aa SHA-1: 1c47171c9e4af0841b85c4f05ca868eb2f7b564a SHA-256: 678993df59b11d7b7f454ea3b3fe24586b6c9df045006f8e5a9cf179ad716d1c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution lure. The presence of a raw IP address in one of the URIs further indicates malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9628

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e46ab5c153b4e6ecd6375093429656b7/36674819909.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/44345b5594a9184671c632bd792dfd88/damapatadapi.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0e672a47---tevegewirasi.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d4c76045c14637279be4b1411d9a16c2/42558473149.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/kawalumivevobitinububaru.pdfPDF link annotation
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d356d784d---wagavati.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7890e2509---9581519182.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/u137plkpmnomu70v4iglmbsgu9/28943065026.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/fc073bdceb2d4d11754c5e202c073fbe/58419345555.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/28669846106.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b60822cda---biwevogije.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/75713085291.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778ce2c242d---23086468903.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7a0b3c9a597cb999dd17180db12c8eaa/14129265955.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bcac5c594e2---86865727675.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/7036102821.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c0638a498---gutikejadolusu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6bbd8d1b7e---33270614108.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/toxojos.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/28014978871.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/0f2qcal4167e91drc8ccp6osq8/jiribigomovomizekod.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/vj6h9bgo4o2bv46bsvc65jd6kh/dibugunifivumusa.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/72280468890.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cb9c2ae18e3d3d596a564dcc9323a052/93199782321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=5s+implementation+manual+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0002028c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2028C 31328 bytes
SHA-256: cf02291bd3abefb27db865b2a5c3a3a6012aa6744f54d11f0bc1ccde2c4f8863
font_01_sfnt_off00023975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23975 10696 bytes
SHA-256: 4da4487ecc594dc0bcd4d6c79630da8c5341b8ded739069e29a33170b5746adf
font_02_sfnt_off000251f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x251F2 18268 bytes
SHA-256: 9418895c21077a7a3156fd2d8f459c735d9984b9e45a9ed8a0ff18fd96ca5063
font_03_sfnt_off00028235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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