Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e3ad9d41780c62…

MALICIOUS

PDF

93.9 KB Created: 2021-08-22 00:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 234170e487dc4038fa2f0e73e178bd0e SHA-1: 3ed10eccc3b4851f22299fd9216a7cfb0b33bf90 SHA-256: 38e3ad9d41780c6282a1bbd02b93e4c8e2192c0d64da4fed264b591f0f4a33a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload directories and other domains, suggesting an attempt to redirect users to malicious content. Embedded JavaScript streams are also present, which could be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cecprint.com/images/file/tadidamib.pdf In PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf2539b045---87780797928.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/9tcf9hgvoc650n7g8jlva0m28l/xiserolulagobojivepuduzed.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/l18v4hlp801l3prtqlr488qq5g/dapirufobogutanemawib.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/wimaxaf.pdfIn PDF document text
    • https://sce.tw/uploads/files/60b7a7626ad96.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/6426729251.pdfIn PDF document text
    • https://chp-travel.ir/data/file/62198735033.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/bezojinateveroxugoke.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/wixuzasogobawedajavut.pdfIn PDF document text
    • https://activepymes.com/pub/file/tuxeresawomivabap.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/zemizenekirowemesibokav.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b9027820ef1---32156068685.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/83215601032.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782579970b2---gubugoruzeko.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160da6d7f990dc---lozomesakegiju.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/besokodasawekegigo.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/31825569475.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/zowegesanoj.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210626202139_94yjlj.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/talobetegujafugino.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/27164759983.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/rjs51leik6oi9u8hd5i4qt63ac/dubesi.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/gotemafabas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=docker+compose+file+version+3+is+not+supportedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 11052 bytes
SHA-256: 435d15442a6aa07fb9f8dba7eabb4d3c6a4cad7498704ecbd4e1c9bc1461a435
font_02_sfnt_off00013b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B11 17396 bytes
SHA-256: d7e2561ef489f56083c246efc4991f3850462d274d14281af212017e0ce4714f

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