Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a3a96a97974c88…

MALICIOUS

PDF

92.1 KB Created: 2021-07-26 13:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 71400138a5be42c9b316448728c6036e SHA-1: a7b0a2cc121a906bb297586f2812a7f733967063 SHA-256: d0a3a96a97974c880eede8fa27766768f8ef57ecbbd252cebe6bc871e1a98536
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a0603b966---norabiwetinizugidovor.pdf In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb85898fb---bumuvewokixukoxuli.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/defobunojunepig.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/16524100325.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/mubazaloromik.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/c72c42ebe85ea92eeb3fdaed86364962/75779083572.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/10492690217.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd844c8972---niviwibexikoxi.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/moradonukidufigamomesat.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/32646804160.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62d3b19e55---27825522475.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb43906d7---pinisivurosiparofami.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/sazomosonazov.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///jijevipubewaxorabobogox.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/saxopapafigexabezu.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/meq7ur83memv3ip6l923dpm65s/95359514856.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/19499913584.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16086e71cccbff---pegogawiri.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bf45880af---vagilifabuduxofam.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210710_121647.pdfIn PDF document text
    • https://csn-alliance.com/data/files/pigapogukuritijujajiluxo.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10c48f3bd---saxuvamumilojenuwep.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b826fc3c8bf---1065084886.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/92a8317184bce1b8a7f50e180f2c271e/kurujapetevesejanij.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/falejuwoniji.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ffac68313---petigonoxuzuzebesepip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+reset+oil+light+2013+dodge+challengerPDF 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_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACD 17204 bytes
SHA-256: 8ef995cb154a404dafa4bbb41b033f3a830e971fecb46e02d2195e8710443a01
font_02_sfnt_off000147b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B3 11192 bytes
SHA-256: db0f0c469947b29b36d8ccc71fb62e737de3940318fdcad7ca68aae95baafa8d