Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f94eb5771949ee…

MALICIOUS

PDF

98.9 KB Created: 2021-09-16 16:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ed8a68253f54baa765bd80a879a53d8 SHA-1: 9057b84024866383dbbe0f74d614a2bb99f9b720 SHA-256: 01f94eb5771949ee3d294cd0a012c11fc3992f2ab70ac11abe06d6e39123b9df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is often used to execute malicious actions or redirect users. The PDF also functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613353643b703---babuzefajegefatefugenu.pdf In PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/43615120245.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/90480682982.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/34842376642.pdfIn PDF document text
    • https://efnnma.org/files/file/metakepimuzeponakawaxaj.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210907_32CD8ABF3534FBAD.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/kupib.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/rs0k8u6rg93d3gm42u1br1kb0q/sixokawamanolar.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/36242864558.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ceb2e01e03e3a0c01775848624fc3d49/lirofixutexamigivobej.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/votusujirojamiben.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/65042359794.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/vajugi.pdfIn PDF document text
    • https://beaszemin.com/files/gujotises.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210914173547.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/16743244190.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/55178538833.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/87317740854.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/93109515995.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/14509488291.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c8daca4dfacef3795bfbadb02c0502d3/38691903865.pdfIn PDF document text
    • http://banquat.com/userfiles/files/zovuradololup.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/jofuforomurirab.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/35705712950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=app+anime+moviePDF 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_off00012079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12079 10048 bytes
SHA-256: e54adcd73b4ae3580e3c22870ee182f8931585d900abbbd67bb7da8056a31da5
font_01_sfnt_off000136c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C6 18168 bytes
SHA-256: 4478d93c0b92721be46fd4901ca4ce3934f40baf3f6aa096fe7b0da3c78d4fa7
font_02_sfnt_off000165e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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