Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddff6a33480dcf67…

MALICIOUS

PDF

71.0 KB Created: 2021-09-22 12:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 502b351a1861ab440bd2fcd773f4d44c SHA-1: da0f686ba636e7dfd8529fce25e873a12c137ac8 SHA-256: ddff6a33480dcf6758d9b2d0ea5e34bdb8ef72116cee633d59ced33bd1e1eca2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are hosted on disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=age+of+sigmar+stormcast+eternals+battletome+pdf PDF link annotation
    • https://technoarc.net/userfiles/file/lejajibugidegafudewuboju.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/95258533352.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161334e9e3842c---73105756176.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/69805448739.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/netizabel.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/pasuvujudosamupudisikula.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/misogasadozitakegi.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/19830163635.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///galotenizirironup.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/pajopapimigemo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f55f1d6cd7---13156159344.pdfIn PDF document text
    • http://agama-rc.com/upload/files/64469177652.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/38366047365.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/pazivawimovulal.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/tojuratekasipakuzuwe.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140931937c83---10984259865.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/pajegubilatofapotiz.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/depuwominasesenevaz.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a95c3d09ab687099304a40a596510f34/jedixofurevaketub.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/16945739081.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/39400492308.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_off0000b2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE1 11084 bytes
SHA-256: 7be08094092f5448248296442197b5b936e11f5f043dd5e985012e0b4416a05f
font_02_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 16284 bytes
SHA-256: faaddd3d9d5b6bc13b824b50ffe5b293d4651050239ebe6f9cebb9353c9e45ba

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