Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffe574b1748fc41…

MALICIOUS

PDF

87.4 KB Created: 2021-08-14 07:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 947cb5606043c428a0dcd14d726353dc SHA-1: c838b0caebf91ee6aeb81ff6148aaca6c56132af SHA-256: 8ffe574b1748fc4193d25c46040ae37497b152745332f29fedabb6e00184fd5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures or malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://chip-chup.hu/upload/file/95565629570.pdf In PDF document text
    • http://habitat3.eu/userfiles/files/69556303184.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/99504062789.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/45335136826.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2ace50dd1---47755492568.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/ketetijelerokeritewomozek.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/92232726947.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160819c1d2d2b6---97175366145.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/26173618057.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/91914065414.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/32916554721.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/63735106135.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8af49ba4b8---80158356673.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/39865726790.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/240648285925606addf6487b61fccc96/45009319034.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/modepugefelomugajunigax.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/10934420592.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/2eoii3ghgop3r31pdcknbrs9f6/waxiripupodideja.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/kunuwitaz.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/bu5k8piaq775f2v0o0hhj705k7/befivogikovedofijepipapoj.pdfIn PDF document text
    • http://mamam.by/upload/File/file/29311833242.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bt899h33pv5n6q70klkpocbk2h/wawiva.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/vulapilixekunan.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/97326122292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tangram+activities+pdfPDF 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_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 17052 bytes
SHA-256: a942286e44c1a7018ae6d207500f2914d54ff54b728340e552698ecfec797c64
font_01_sfnt_off00011efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFC 10824 bytes
SHA-256: eefe6f6a5211f65af9dcec15e149e4c31348c5b3cbe99be34abfee38a661a6a2
font_02_sfnt_off000137cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1