Malicious PDF — malware analysis report

Static analysis result for SHA-256 0880d9c6c8e3c1f3…

MALICIOUS

PDF

91.2 KB Created: 2021-08-01 07:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 758086815d57405ace2909f8e8c2e2b5 SHA-1: 0a8667f776a45f25c7ea7799fd92b14fdda5db2d SHA-256: 0880d9c6c8e3c1f38270a6aee3bfda8aca5e7e412edf71c0c8253a53d6016465
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via 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 http://ykzn8.com/upfiles/editor/files/kakikebozo.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607445fd082a4---namofonemuganuwa.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/547b9c0939f84f0f3de99968225fe98b/17523159076.pdf
    • https://ottenburger.com/userfiles/file/14284026898.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1595de7923a47c22db8065c1f8233b42/tezatipafozug.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/92ed8fb6fa117e519d43bf2ec100d364/60810099350.pdf
    • https://healthmatters.me/userfiles/file/65046392102.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/860fa49f74d2aadeaf75eb96d1a52f9a/98288748229.pdf
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/71717078346.pdf
    • http://happyland-nsk.net/ckfinder/userfiles/files/39015464998.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/67eb90e70081b9597700d10b52f2d0cc/mupewelokafogitapivezuj.pdf
    • https://bywuf.org/upload/editor/files/28435664798.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a98b44b667---30395645823.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160719b7086d29---juvodamizaligemijoruf.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/elu310f5ukec8kuq9maokebv86/72203710739.pdf
    • http://webursitet.org/Files/file/28844566998.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2652b37ccab4008c9fed30c45e8322e2/lipobe.pdf
    • http://aklond.com/UploadFilesfile///2021051105103896.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1635271e54---92532358560.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/9p7hgqppqrmf74sfklssl3re6s/28122491292.pdf
    • https://topclassgardening.nl/images/file/60083297421.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b60257f2434---vakobu.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/92383141391707b02746ddf45efa7aba/96311973909.pdf
    • https://eobliecky.sk/userfiles/file/52088473400.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=walmart+assessment+answers+quizlet
    • https://www.posluh.hr/ckfinder/userfiles/files/16941316768.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_off00010449.bin
b548f858ec9ad43e05756227aa23c7fc9e2a92c8caa3b7ba69230d2f5a6402c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 10536 bytes
font_01_sfnt_off00011c4d.bin
6d46ee25ebd8524139123c0696a4acbb771862298baeeb540b107344b8cc086b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4D 16500 bytes
font_02_sfnt_off00014678.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14678 16792 bytes