Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f71698e250ff87…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 08:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8dbd1b4ce1bd9334b5d1a020a5b154f SHA-1: facc0ed0e7e9019c670fc23ec3612f75767fa596 SHA-256: b7f71698e250ff870f56043e9ab53857852db55eea9786f3126e4293d4a38690
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://queure.ru/uplcv?utm_term=great+daniff+puppies+for+sale PDF link annotation
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/bf6c006bd9f07c142688a5c14f8a5d4d/rodafajagone.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f8a2e03b3---64525547036.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114f26246c48---9256913144.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/66009996206.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/xapebarawisituno.pdfIn PDF document text
    • https://tsegypt.com/file/95428449984.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/weguwuzesazarase.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/23615214932.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/49481995456.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/2ffq6hkukhljsp1agcq0bsn70b/14952757959.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/36684688014.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/74649450504.pdfIn PDF document text
    • http://wenxuezj.com/images/File/maxulotasegevi.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/aa60754f2c33e83df7ec9cc1c0a413d7/64628596487.pdfIn PDF document text
    • http://cl-pub.com/files/files/99430453854.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/mododesitawipos.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/34cda3fe098ee3958b6259c8642b4fba/lipefefurepagimugelipelo.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-08-19/21081916551874335923gxjkmginvp.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/31047704f96f0cd789baefc1bc052c01/51139002701.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/htoqc4e67d4pcitjvtsfh0f0ga/50373271028.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/9023352137.pdfIn PDF document text
    • http://esistore.de/userfiles/file/fakedanifemati.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/3915fb2698566146eb89dfd29160d6fb/jivaxeriju.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/fazisonuvugixukagidaxona.pdfIn PDF document text
    • 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_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 10632 bytes
SHA-256: 90944336ccbf0870cb76f315220438886c9fecdd93cbe60d3b31c5ba9130fd2c
font_01_sfnt_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 18220 bytes
SHA-256: 553237cd4f0152b31fcb5e86b4148e2900312401228d02a0213ee321eccb813f

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