Malicious PDF — malware analysis report

Static analysis result for SHA-256 31017981520adb8e…

MALICIOUS

PDF

86.1 KB Created: 2021-08-06 14:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f4fbd65c3e254d7ac63668f02e71eba SHA-1: dc5c37a51021a27e4f95a6c44be5eaf6f5a7a4d1 SHA-256: 31017981520adb8ea4fd8605aa357fa8fe956c910bb514540dfa3afe8ba674b4
164 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's designed to distribute further malicious content. The 'SE_INVOICE_LURE' heuristic further supports that the document's content is intended to trick the user into downloading a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://esen-life.com/userfiles/file/tijevijubaxudizeloxemu.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2774b1d252---63785007100.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sadegukukimator.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/fupasijilaxozemojudu.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/4203279434.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/q5e06b75nuuvgvqbr31hqccra3/bemuxi.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160885974274c1---41539626931.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160882e03f0cc9---mediw.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8a56958df---71193273364.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/61311194185.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/42d747b3e5cb13756f9941b948d37e44/36587273938.pdfIn PDF document text
    • http://promador.pl/userfiles/file/vetaxika.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/fb753dcfc2bab2f25ae9ef2c44e1b62e/jugojawekukidetefasoroj.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/73udmh7p32lrplbuca0j5hvg5c/24427838909.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/607b06ac99366c98d39b2542ad110a03/segixa.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/bc58922cc8f3362fc544166d6b2bbaea/22300535435.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/9f8a29d2181ae6996993d532f126d7d9/3987825150.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b845d673b03---goxapimawuwepinuwosisogiz.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751087c1a8b---fafilejirigudukuxa.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/95093082815.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/clhl45hs9fnfket30re985jf8q/57250140261.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1517d85445304da4c1fc0c73162fb5f7/41784919549.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/99409538941.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/wudaxezakulepilizegulu.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/6j5aq6ik4kd9i53dtmq58krl52/jatuvosisasijujazu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607594b020067---xizapifivenaverurizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+can+i+check+my+traffic+challan+online+in+maharashtraPDF 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_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 16692 bytes
SHA-256: 54583c40a4fcdf523d7e147453bf8b51025218fc459a495de5342fcc93b718cb
font_02_sfnt_off00013133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13133 10884 bytes
SHA-256: e9207c9bb2ec582d0f8ae3f72db8f4acbc9660ee314069e2b4f6aa6b0af9e38c

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