Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabd76c082587a31…

MALICIOUS

PDF

73.5 KB Created: 2021-09-04 04:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e38cdace430a6069be1c31aba096363 SHA-1: 283b3c7c0902c5e5b0451f763b42b193eea2bddc SHA-256: aabd76c082587a31ecb6f90d2e38efefbb2c9df3f02105425700274367d795fe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://drafthe.ru/uplcv?utm_term=quick+weight+loss+diet+plan+2+weeks+pdf PDF link annotation
    • https://groupunsur4.com/contents//files/64139780746.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/nexafu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f48ba5ac7---lisukororoveronovobuduw.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed163ead9f---19400115922.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061319272273499.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/52735498415.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/44665690220.pdfIn PDF document text
    • http://brenderup.ro/mm/file/91742153808.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c0213a58f---61843239758.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/fodetepulotakovi.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/dumedifudixibufena.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/39521418598.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da91f906a54---11016681394.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72da0a4929---rubamukotuvawunepenefevo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078871ad427d---kiwapikawivuzasivimafatud.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf33b5b45a---95807837007.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/5e83e7f3856f6cd12e20847a7bdd971c/garewumasabunutazedo.pdfIn PDF document text
    • https://nowtravelasia.com/userfiles/files/bobuzolonokoruxufororuf.pdfIn PDF document text
    • https://yodobashi-church.com/99888370407.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/50739312995.pdfIn PDF document text
    • http://redactron.com/userfiles/file/85715533601.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844381a4ce7---zusovemanujezugez.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/95592028698.pdfIn PDF document text
    • 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_off0000ba05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD217 17544 bytes
SHA-256: c9037bbc1141231a9e518523789d767269358ad85fe3884cb55c83224411d224
font_02_sfnt_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 11256 bytes
SHA-256: 60116bdca541a68754f18185be6f9136a9acdd7f145413462f53b24a4c518669

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