Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee578b6fd98c5498…

MALICIOUS

PDF

72.2 KB Created: 2021-06-01 03:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 008aa32b8269dce1e1cbc30d1239006b SHA-1: a811dbbb9ba66b93e4ab5278c53ea74228bf9d71 SHA-256: ee578b6fd98c54987b2172cd612a86312f88387d8552ec0025fade9c057e30fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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 https://catamma.ru/uplcv?utm_term=slow+cook+chicken+taco+filling
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd64329598---feker.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160856eb56c6e0---ruleferidukiselobejifi.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f118217b---59778477218.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3a10be38ddbf240aae9adb19c65fd26d/dujafoxadimukupuv.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9ac96dbb---tetudowalejabokox.pdf
    • http://sskj.pl/userfiles/file/setoxidakigaretipanomi.pdf
    • http://10glazsikeyrosa.ru/file/minux.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/1afca006a4cb9a735e7ee7fd286b5971/72167262857.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/2cb55da1f8391b04531860b1e945fe8a/duguxewof.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/bmv3ob59rfqmjkri19gqdduiq3/25540588848.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59f9ac3558---desoxelixulifiruvifufu.pdf
    • http://ahchala.com/img/file/zewagofefebovegunubufotif.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/2cff04be2880e1568fd7abb344d4a921/jajemibem.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc2705631e---38446388552.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f46a5052a---vuxiwigamibuza.pdf
    • http://gesundezellen.de/neu/userfiles/file/teduvixebegabunijisowexoj.pdf
    • https://allcreaturesinc.com/files/files/8108001678.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609887720c04b---2361360710.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db65.bin
60cd863e647a34c90e2fa3cf743408f96c8a8a9b622343574cdd77fb7142c145
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB65 5128 bytes
font_01_sfnt_off0000ecfc.bin
cbbbbed0eeb959613f3c30293f174beab8ac738c3fa329a1377627d54be24286
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 10764 bytes