Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0baf679ef2a1f11…

MALICIOUS

PDF

88.7 KB Created: 2021-06-28 06:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5afb69547a375e541c5c73cde3f7538e SHA-1: 4291c1843a5515325b0eb595c7b8023a59ea585f SHA-256: a0baf679ef2a1f11d4efeb5aff699f152c89f5605c213db13eb7c7841a410c1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a PDF-based phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/58e31ad9b081d9483f1cceafbf279680/kokovetakuv.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798fc2ab8f4---tomesodiwabadezipozotef.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c72c7e08---nenipamokif.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/38083707949.pdf
    • http://altelaw.com/uploads/image/file/zosutewevox.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3be7204f---rakeliveworidix.pdf
    • https://addsfly.com/userfiles/file/zuzumirirutojaw.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084e099e17bb---9365625914.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/25510261154.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608286869a2f0---41459878162.pdf
    • http://boxethai38.com/upload/file/lasonavefowuvis.pdf
    • https://asset-books.com/userfiles/file/sidovowivizix.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c8764f4eaba93e2eeeb68f8a00dfeec7/21719185667.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/bp4u5k3425uj1hp3sm3d0gckvc/fujedusixopogogekor.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a600a7d3346---jutokozumezo.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/e2a3011260dc0e406ccea341cf354b61/60448027846.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/97412173633.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d069f5f3d3729976d49691772a272b16/50322287531.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfda2548332---63215159971.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0377a25a9---diverimis.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/0b812c5bd25cfe7ef5d695d9c39bfb36/8853402642.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a964c77f042---judixinodidigikawupitil.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9aqol3db7f7d723bdqngimqd61/digoxel.pdf
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/39597473175.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/d049aa8bdd4d5bd9ac24d1fe9dccb743/tudagefexisenataz.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b6c1f2fdb6b79584e9d771d0822ecd79/22285093501.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nda+question+paper+pdf+download+with+solution
    • 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_off0000f72a.bin
9aa7f6157917ed6bf0675a4d81b9acda4e0252b0ca5ef574cce7dc3583c2da72
pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 10904 bytes
font_01_sfnt_off0001102b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1102B 16792 bytes
font_02_sfnt_off0001283d.bin
2b46640aa3e8a09c0b3a51e42692767982fae279beb09b69ac13013fb17eba17
pdf-font-stream PDF embedded font (sfnt) at offset 0x1283D 17264 bytes