Malicious PDF — malware analysis report

Static analysis result for SHA-256 516892b14086cfc2…

MALICIOUS

PDF

90.6 KB Created: 2021-07-22 10:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b65b22fc53c4819fc7f21f580dd229a7 SHA-1: 554cb9909db9fbe8cfd4a2a94e7a798697945c2e SHA-256: 516892b14086cfc2c5bce3433a8cc58d2e922ec4e0ca2a00b7d84e40030d4b6c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/h9lgm82t6q26tibauoanisid28/51466381711.pdf
    • http://reguitti-engineering.it/userfiles/files/wusoruzamarubamiributex.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/v3jhhdpevs8jbbu3lu687as2ha/risesivojimemivisew.pdf
    • http://tv-kitchen.ru/files/files/23999279770.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d92d0b19e---rupuweradugaga.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d216824703ee29b0bc2d4efb514cac9e/32322744488.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff54ab5928---puxesokudebonozasogo.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1a6fef740db7c3309405b6b9ba08494f/74258232903.pdf
    • http://pelesiuvalymas.lt/i/File/77055747367.pdf
    • http://pi-consulting.ch/download/12761012484.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/abaf01dda326d69d1c1539c2f5bf14db/zopubisawizotaz.pdf
    • https://bititechnika.com/uploads/file/1508072941.pdf
    • http://accessiblevehicleservices.com/userfiles/file/povojilolisidaperorobanej.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f7227d63d90da93a93f3bc64648cc9d1/ganedazutudofawevutukel.pdf
    • https://allcreaturesinc.com/files/files/6322980915.pdf
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/70707771152.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b86e5847213---repaninomidebamozebix.pdf
    • https://evergreencans.com/userfiles/file/wumojojutus.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/463dd88bc281496a14313d0e708e6266/wubikirozuxur.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f92d5cfb98---ferizowenutalonoropabusoz.pdf
    • https://whiteplacard.com/UserFiles/file/9868391621.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=learn+music+production+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_off0000fe78.bin
0b1ea282ba544eda1d868c81fb54e2fefadc3d6e530c29320c39df513809aa41
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 17384 bytes
font_01_sfnt_off00012b96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B96 16792 bytes
font_02_sfnt_off000143ad.bin
11b2b3fe68dfc196ff27ccfe3558d2f82606ad0a23e93ee76d13ea14abb419bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x143AD 10792 bytes