Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a3dc9b2b9f363c…

MALICIOUS

PDF

87.3 KB Created: 2021-07-08 01:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e1316efded48d2694f4fd39c66c4a96 SHA-1: ee4e1975994db2908dd4fef7f3e4af46c02007ae SHA-256: c9a3dc9b2b9f363cc22503cfd5af455b58b7cad78c7bff52f6de0dbc5e032863
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/085851ff28d36f3e177405281623bbc7/71685928583.pdf In PDF document text
    • http://libertyquad72.fr/userfiles/file/34382460702.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073a640df999---48734074022.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210505201751932.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/20249171880.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/vo7cp654r5k461hdgilss7u321/furaxidafenetamomasame.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/tebumabik.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/92955537294.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/podetivezomisilijisileje.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/41936944251.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbcf6861d2---3487186455.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/pozolixed.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b21161ca---miferefevizozizigokale.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b1884e86d---88691377650.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/n1lkip7iqt4l24tbgs6qodu8c4/44247473676.pdfIn PDF document text
    • https://np21bellapalermoshopping.it/file/99580433783.pdfIn PDF document text
    • http://brukbet.com/user_images/file/wazezinefomivo.pdfIn PDF document text
    • http://ihdbd.org/upload/files/wuraresanatewifa.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/887d0b4296d7590e8d87973468a4b43a/74133796310.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/daj0mq61v85g3rmvkmqdfmjp33/rimebe.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/17961550268.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a429a23b68a---5157060588.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf856c58d---lisenuwa.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/dimavemukazemijenaj.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1287197bd1cacd0ac0e9f550f862e679/81638736126.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/49119245856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=signs+and+symptoms+of+chickenpoxPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 16440 bytes
SHA-256: 614cf5cdcbc7df4df08fb058f4c0dcf3d03007685c5e5255fc8d8ce2c416daa7
font_01_sfnt_off00011d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13598 11304 bytes
SHA-256: 496238122452ad1d456aa3eea2cce6e110d67e8ca4f62a5f0d29637da9bf8209

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