Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cae32ea35ba947b…

MALICIOUS

PDF

96.6 KB Created: 2021-08-17 19:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af9ac5a11e28529319bb0a382e836e1f SHA-1: 9e776627821e4c11fa6a0d5c09c970e55e573358 SHA-256: 8cae32ea35ba947b7fa7bd27dae777e5c21150ce3058bafdabf2dc16630287e2
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple PDF files hosted on disposable domains, a common tactic for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method to evade initial gateway scanning. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/214631344060fef5971e5bc.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/fudosavebetavako.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca4fee672d---mobopuguxibazewatopakobup.pdf
    • https://aterhesseg.com/up_image/file/xejonazibepepa.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/59015901206.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b68a48d37---segemuvokipugepet.pdf
    • http://dolphinegypt.net/userfiles/file/depivi.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/026eaf0e781ac5adbd48e413ad526b09/jalodobisozexogujaluk.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/55s97lo3rtq21a8fp4plk44fmc/ruruwivufij.pdf
    • https://ou-ravda.com/ckfinder/userfiles/files/19320256492.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c4cc148d---xiziwisalutigoluzeluro.pdf
    • https://emmaushuis.org/pages/kukalid.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3627d25d6c---4233479487.pdf
    • https://bulendengin.com/upload/ckfinder/files/jilapij.pdf
    • http://mdknoodles.co/uploads/files/wiveronavisafunozuke.pdf
    • https://aprilboya.com/userfiles/file/22010501036.pdf
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/naxuwasowote.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4b987fa8c4f0d5bdfc9def95045d1573/madiwuxexevuraza.pdf
    • http://bearings-home.com/userfiles/file/levusedowowupelupi.pdf
    • http://spharma.ua/files/file/batesororiso.pdf
    • http://kapelski.pl/userfiles/file/98089843681.pdf
    • http://hanhthien.net/uploads/file/wuretivupusasagadokinare.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e39429fc5---55338174217.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=solucionario+matematica+avanzada+para+ingenieria+glyn+james+2da+edicion
    • 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
stream_005_off000146e4.bin
4838f170b25e48a7964544140c7e9bcd447b10435949a1e62952d525c2df27e3
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x146E4 25380 bytes
font_00_sfnt_off0000e047.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 16792 bytes
font_01_sfnt_off0000f859.bin
b448af093424c139d6d61651ed501d9386b247836cc11d652009e353ac4f702d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 20360 bytes
font_02_sfnt_off00012bc1.bin
097198fc2ea4ab8043215943014b5e0e47e60eeb4c51e260cb3727057f57633a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC1 11520 bytes