Malicious PDF — malware analysis report

Static analysis result for SHA-256 365dbfb9b4454a1b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 03:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0431a12767aff32abb9ee4327cd0c68e SHA-1: 5c68caf090fe06c4f467271a5823ea85759dd516 SHA-256: 365dbfb9b4454a1b343be37aaabf7d82f2c945425e09af1e59d18464acc0f722
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The document body was unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a malicious intent to redirect users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://laborke.ru/uplcv?utm_term=car+game+android+app PDF link annotation
    • https://fzclicks.com/demo/files/editor/file/tedunudipavewi.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210913_0E7271BADD4B3FE6.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/kebupawak.pdfIn PDF document text
    • http://sial.pl/galeria/file/xuxilugugusozidifilalimul.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/40626802502.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/f45076308eba481803c23929615322d3/semovepoga.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/vemuzo.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/pinebelemipagutofipajafu.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/11397784669.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132553d4e319---98967493068.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8bd6aa60---fetepelikopu.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/visotunamebu.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/setuwupoja.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/51881570549.pdfIn PDF document text
    • https://camelcarpet.org/d/files/94177492099.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4899f40bd3674d380ec74d0d9a3ea164/futirimovokimajo.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/wesud.pdfIn PDF document text
    • http://elpijisystem.com/file/jitorowofubononosemeg.pdfIn PDF document text
    • http://regmac.net/userfiles/files/jomotaledivif.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/94888636982.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/45198292814.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a5d5ccdbe42693e0f8d7118809a1b505/25879674525.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/kanozedoxifitejanusoguvu.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_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 17752 bytes
SHA-256: 3628705f86184feccbf92dda4d7b2f0c246c814f529d620d8f29d6eca0fd056d
font_01_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12947 10452 bytes
SHA-256: 735c898142b3fd898eab2f3c767bf25c9eec26e2150e56dbc2129b2c6674979b

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