Malicious PDF — malware analysis report

Static analysis result for SHA-256 919c0de919e9c6c8…

MALICIOUS

PDF

86.2 KB Created: 2021-07-04 17:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8a99c7c2d568276cab65870e3e6637b9 SHA-1: e4e103a4473f52c96d2e1ced85aac933b4750eac SHA-256: 919c0de919e9c6c83247e0f62cee1aaf2c3518909ea5ca9b0290428797c0f680
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The presence of these links suggests an attempt to lure users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://akcjonariusz.com/UserFiles/file/75670878257.pdf In PDF document text
    • https://alatheir.com/atheirwsfiles/file/38333116640.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6183e53ab9a5177e0b883e6667db5aa2/jimujobofel.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f641866d0c3e1e3a1e8eaa1a0152b696/tisexaxaruzomozenadumok.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097ce110ffe8---wekinuzoletuvivolapod.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/a964f7b2bced380babad0d770efb3e29/69446665212.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4i0tec6tp3lv6n3pn2hmvnk5io/21204808454.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/4fb609fb2e1d5af733a2e718cac0f2e4/72177587715.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/94186a7e2d2bc3c2fc034b50bc2e7263/93496549418.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160965df098a52---86863848092.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2e276271c7acd6699c2cd4f3355dbab3/mugasikasukifini.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/konosenuzeritifexifuwik.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/vipofinenume.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/61700657284.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/3485b3cab698208f455c4ed6905fd365/wamolorojozulajisuw.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dee32f5ac71---fipananufuvib.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d65a110e817---jitatowelerijanetagew.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb63b52627---51215866207.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf76c107e0---jinowixisipilur.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/3f7fc7d303c9b2a77a9330fec13d755d/fasavitamefanudexeg.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/35811768180.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6b998532be99ab222f4e83b5e534f049/zesekanab.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae637de6031---mibolarug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=jackie+collins+lucky+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 10712 bytes
SHA-256: b47087775520877fa05a539f9e7a836f784a5601f514b6e5ace14d7d5014aa87
font_01_sfnt_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B62 18088 bytes
SHA-256: 4e55e469eb5cff469f32d3f98946a6871740803ec8f6ae59ffd3b31ef0f179e7

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