Malicious PDF — malware analysis report

Static analysis result for SHA-256 895d2873b287d427…

MALICIOUS

PDF

91.5 KB Created: 2021-09-04 06:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3226849ee93efd117f3d5f76199630b2 SHA-1: f4989ef8fcc538bb0b7a1ac982ced772f4f72fc0 SHA-256: 895d2873b287d427515e2d9e8c0329e669bf53873c6f4b00826e3a0299ccafd5
156 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves redirecting users through these links to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://abwninemile.com/uploads/files/78246861479.pdf
    • https://yuanfuconstruction.com/ckfinder/upload/files/datixako.pdf
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/misozaralixemituxanawa.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02229b8ec---lulajulot.pdf
    • http://mousike.it/img_ins/files/fafeforitomaxokaf.pdf
    • https://lesura.net/userfiles/file/tudisatusemisizuzufe.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sgvme2p24bmc89kgbv1sdktl30/96846203814.pdf
    • https://trvstore.com/userfiles/file/tewaw.pdf
    • http://abwhopewell.com/uploads/files/vapeneset.pdf
    • https://eseninternational.com/uploads/files/39791370193.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d03d2d2222b---xejekowutajopa.pdf
    • http://myucmas.com/userfiles/file/wuvuputorasixuv.pdf
    • http://keralabiblesociety.com/fck_uploads/file/feropiwajuzuzukodibomelu.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611e7ea9535b7---kiluxem.pdf
    • http://learningkey.org/userfiles/dorujifiwadodel.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d203656513---wimipukajitaji.pdf
    • http://studiotecnicoforace.eu/userfiles/files/30587147623.pdf
    • https://newtech-utm.pl/userfiles/file/wevaxifelukera.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/6316436135e6d6bc61bb4861e6a0ea13/motifivegijabedekaw.pdf
    • http://engineersclasses4competition.com/files/others/28484910679.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/26ca5cc4d493ca2aec20a99eb199b998/vakazosijidadowuwaraziwit.pdf
    • http://vce34.ru/attachments/file/39637334193.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c671fe4166d---xibexasobemuga.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=midnight+sun+chapter+13-24+pdf+indonesia
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e410.bin
8d517692558e2b82520c3ebc5a3172ee0b1f3f20d902d0e15cc4c5ab54ec65b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 17984 bytes
font_01_sfnt_off00011260.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 16792 bytes
font_02_sfnt_off00012a71.bin
2b3f69304cf66f5eaaeeaeea38ea11adf5f89c35156bd3a92f6e3dbccb6d46d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A71 17420 bytes
font_03_sfnt_off000144e0.bin
b1b4a1642bbeedaf591230920d991fbd0cc51c8cb109cb5f98f4f62f1cc9bbb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x144E0 11400 bytes