Malicious PDF — malware analysis report

Static analysis result for SHA-256 17941b9d8e615ea5…

MALICIOUS

PDF

86.0 KB Created: 2021-06-20 18:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e69b6718aa5b273c47d588a33df2757 SHA-1: 8d6a3eb8ceafebe5b6118bd82acf9ccb883e981d SHA-256: 17941b9d8e615ea5276c2a1523078300a8c62061a8c4bed812d3ec1d338e4f19
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 upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacb5395d03---gagodedivejudogubi.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe5dba184e---zeduzubesejasalat.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160741bae62f53---82593587590.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/ffde9a36458b2683897cc598c09bca66/67809372331.pdf
    • http://architettorobertafasola.eu/userfiles/files/wajobiwusafakupogedomet.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d25a598ef---92399285957.pdf
    • http://arcomproltd.com/userfiles/file/zolopudolipuse.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0d19bb2fd---wafobudezoke.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f91f6b025---605942851.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/17da6c73f3dd1e07ff08735911ca2371/28585457903.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/bea632351bfa14bb96b0b23fa4c31b1e/riwuviselukunurasolir.pdf
    • http://akicgiyim.com/userfiles/file/39516823726.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d156558fdc8408dab452a60679f898b3/pexeva.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/3a894fefc988eb65f2dc006a00dc2ac4/debisisuzewatigu.pdf
    • https://cochleartudaskozpont.hufiles/76943183046.pdf
    • http://ankurgroups.com/userfiles/file/43926488883.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hv9159h3ioh6ne1kinmrtjtpb5/xifuwuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tft+carry+items
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010997.bin
5e3371a1d0be98829c7de073febf0c178ba3a98ae6630fee68e55aeda325f8d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 5044 bytes
font_01_sfnt_off00011aad.bin
85959640c08d7bcb1701dba1fba07c5d73379a255d027c90b5ced51d5eeea2ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 2628 bytes
font_02_sfnt_off000125d4.bin
341b52483eeddc6f6c0d8132437262085f12f87b5e654784d4dd5bb1b0653cce
pdf-font-stream PDF embedded font (sfnt) at offset 0x125D4 10464 bytes