Malicious PDF — malware analysis report

Static analysis result for SHA-256 2196c6b38f37e5da…

MALICIOUS

PDF

83.7 KB Created: 2021-09-11 03:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d23bba31c5d2b0385a6e3efbf15fce15 SHA-1: fc7c6a68b9656b9cf802f5e621d31376e6251773 SHA-256: 2196c6b38f37e5daa65b141fe0f5ee37ce0025cdd728c8be8feb59bad21b66fe
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, hosting numerous links to external PDFs, some on compromised CMS uploads. The presence of urgency language further supports a phishing or social engineering attack. No scripts were extracted, but the overall structure points to a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://bortran.com/upload/image/file/20210902082304.pdf In PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3c55eec2---polanasijorabuzuxi.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/64duagj67pbtomabvql8h7aton/medan.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/robofitazutum.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/vafusekerifiserusodezit.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161367c22893f7---zanesumamefojozobinojinuv.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/rixodivenex.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/52272742131.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/15064026694.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/bojovitegusararaluxigofiw.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/topudupidusimigepemeruw.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/vazafamatifo.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/32838657199.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/63624563965.pdfIn PDF document text
    • http://innotack.com/userfiles/file/71784011272.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/93821601086.pdfIn PDF document text
    • http://blgjad.com/upload/files/dowasodixed.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/porigon.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/63510675619.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/redinoz.pdfIn PDF document text
    • http://juha.be/_files/file/79715472384.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/luvetetexafigagonadiw.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/xuwinasisagaporenejase.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/22667448770.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/91547613113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=turbo+vpn+apk+download+pcPDF 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_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 17848 bytes
SHA-256: dd67374e2387ab404266e5c729f3d85e50cbdb2622965dba170d3dd6efb4a9aa
font_02_sfnt_off0001295d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295D 10464 bytes
SHA-256: c2611bd12d5f7c10f10cfb11048bcc351424f62102ae209215408a6ad817639b

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