Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba3a1cb5ed8dc80…

MALICIOUS

PDF

99.9 KB Created: 2021-06-25 15:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c316d3b417af8cb156579571664c9972 SHA-1: 7d11153be5f6687f6ab025e1375d1b94835d33e7 SHA-256: fba3a1cb5ed8dc80e539cbd6efa16989c1982d4872d830f108b2ff540f4bbfae
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af963276ef7---36142440557.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/659512faabd345f10de7ddd5e536a69b/katolo.pdf
    • https://vandolderskb.com/images/usr/tuxugoreviv.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4b2cd16a---xerigikikadazuzapemak.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c6b13c4034edd9056d8df4440c43d93f/lujonoxumokevilipi.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0f2bb07d8f879a91da215c2755e8305e/fajizigelidej.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/6cmhnls2imo2vi5s0htorc9g2q/5628420615.pdf
    • http://aceonlinementors.com/userfiles/file/naluzijevapifebafeposade.pdf
    • http://sewakendragroup.com/userfiles/file/80556099018.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/a4936926ca19bc223361ff17afd2dab8/vupibimudumejararozoguj.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe30153420---97787078062.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a28be6c4208---rarid.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16096a673341a7---zepolijovepa.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a94a25983e---64864485393.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076660954062---refabeguvil.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d5b0d82b8fa718fbdfe2797d093971dd/duzuxogekirewijuwubeg.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160730258680e5---nolovajidejinajere.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097f21ab12ee---xafosixi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=legs+eleven+meaning
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014016.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14016 18328 bytes
font_00_sfnt_off0000f25e.bin
d2b83f0f561e262195bf47338279dd3b3ea6d6fa498ec6144207dbd8322e3913
pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 21912 bytes
font_01_sfnt_off00012805.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12805 16792 bytes
font_03_sfnt_off00015db8.bin
61c55a5a9bc73504ff5d3acf37f98e4c697c536ea9a560d1c22719182db633b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB8 10156 bytes
font_04_sfnt_off00017451.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x17451 3464 bytes