Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64cde3a9d56daa3…

MALICIOUS

PDF

95.2 KB Created: 2021-07-02 15:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55e0dee1e2b53d605b42c30ecae1b822 SHA-1: 230f4625cbb99bba437f7294eb41f3bc9fb02840 SHA-256: b64cde3a9d56daa3057f1d1369c89aeb4b6c041ebb68a91c59e305a0f09325e9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • 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.
  • 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://nslogisticservice.com/userfiles/files/59982760474.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1898926a---pupuxeratuwumezoben.pdf
    • http://chickendaylacrescenta.com/uploads/files/56460047596.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789d5377575---boboseratalufofu.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/924e244c0b1e2a1275cbce489ffe846f/relanajikefifoxawar.pdf
    • http://aihyang.com/userfiles/file/1011104850.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/326896fc734456ef673ff9eec2d177b8/56262470379.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/dixegenolufasemek.pdf
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boxopaburejoxusikiw.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/sprjttti60pstuc9knep7uhv95/lebigakonobinoguluwosib.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a77d2127001---fasaponokadud.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b6220293072---95722176952.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/48af4ef6609d4049659f8025a9c65f12/zupokinimojedopoliloloxin.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ef960e11a8fe6e07e4afb0555fd5f0c1/reruvudigujowamagiz.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/77157097118.pdf
    • http://clubselectionvoyages.com/images/file/jaxamutur.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e8e50e1d9---18355809747.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dedf9b47cfc---rufufijojalepozexeguzete.pdf
    • http://schokobrunnen.com/idata/mapukinezebasu.pdf
    • http://ekotop.eu/userfiles/file/86017976452.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d58fb8392---29994672202.pdf
    • http://kielcenoca.pl/files/file/kebupuvisuravimoxep.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db3b96a8e39---48464228570.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90d02ddd4---72958322234.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=another+word+for+antimicrobial
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e0ba4aaf0723f695c191da08a2aec1b8/guwararasesapid.pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/33987418557.pdf
    • 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_off00010d85.bin
21f0ea4922dbb6c1a6f765e5ba98fd6a603c37932a5adf11b343c6e9e1a339f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 17988 bytes
font_01_sfnt_off00013ceb.bin
eaf387ec1ae9a5795a36eb941bc763fbecd7f0660dd4aeb2111b8ed9f0d04018
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEB 10780 bytes
font_02_sfnt_off00015598.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15598 16792 bytes