Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcd8b54354c023f…

MALICIOUS

PDF

87.4 KB Created: 2021-07-15 10:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee76c72563965891e8ad6f2d7559643a SHA-1: ecccda1c9c74bb0ddbd309db774406fb4e24bc1a SHA-256: 7dcd8b54354c023f42ff959ec28853447b6222acbf145234f7b6e118c75ee782
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Internal Spearphishing T1204.002 Malicious Link

This PDF document exhibits multiple social engineering lures, including a password-protected archive handoff and an MFA prompt, suggesting an attempt to harvest credentials or bypass security measures. The document also contains numerous links to potentially compromised websites, indicating a link farm designed to distribute malicious content. While no scripts were directly extracted, the presence of PDF-specific heuristics and the ML classifier's high confidence score strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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://xn----otbbfbbknchz.xn--p1ai/sadm_files/zelusudibirubikusiva.pdf
    • http://eksan-ltd.com/userfiles/file/soworafavewevulidulerime.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db65310629---84956444170.pdf
    • http://icltindia.in/userfiles/file/42687952315.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/0ba869b22eeadaaaf22efe7b1ca1722a/memufesefazejaw.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/886a6f7f756d126ecfb81c1d80dbfdc5/81873907746.pdf
    • https://betenenergy.com/sites/default/files/file/nasuzubofuzesojot.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/t06lmsgmqgr88erqn5tpbujvge/34390172191.pdf
    • http://fouladsazanco.com/Upload/file/77300020742.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/9c568d149f178770fa340a32088a53da/22657013657.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160849b58ccb60---8499574405.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/4vcda400gffu3r19c7ji593kfo/59596502800.pdf
    • http://daiichilogistics.com/uploads/news_file/zerexan.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aed12384d3d---xijaworuleredikuluvi.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/efaca6c255e1d92543a474dedc5d85fb/rojokavegewis.pdf
    • https://sgotomotiv.org/upload/files/lisin.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/10a7d1ea5aceb45bd1866d0f801f9bdf/87140131225.pdf
    • http://szao-spb.ru/images/news/file/gukep.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b66c9439f55---17020514149.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f78e85a43222c1e34902041943e45f56/1320117702.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b81230089---36394014224.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4483677e1d---34842876791.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc39e5c389---75570700820.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=recover+pdf+password+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc6.bin
ad7b7ce4ae27a71105fbcaf6aff7be058dc60a5ac21d90fa08bb8f5eb08954e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 10712 bytes
font_01_sfnt_off00010882.bin
0f457a0dcd87d7da838623ff21342e10e2c0f5993784741ceb47b706b67a4886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 18096 bytes
font_02_sfnt_off0001383f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1383F 16792 bytes

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