Malicious PDF — malware analysis report

Static analysis result for SHA-256 b403fe4202b17f9d…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 21:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a2804d7da217f92314343799b2b918d1 SHA-1: ad4be6865357c4c4e430881bc9455fd9da401c69 SHA-256: b403fe4202b17f9d1bfe3e744de54c3cf413defd58b0b8d2cf05008fa576b714
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the link farm nature is a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086670880db3---66805478113.pdf In PDF document text
    • http://iglozawiercie.pl/zdjecia/file/39547526575.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/35047352156.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/vufemalutakos.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/7163552612.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/wozutokakesefufuxavivobu.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/47376655017.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa7b31253f---28834504218.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/60584141078.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/muvokoxij.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/51741273875.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5sqmr4bnqt78i4vo14kto9ecl0/zakifeboguxomapapujabadi.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/6612658804.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/58825995174.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ecae36595297f9164527addc92fc1958/xupunazuwiwudoxirusaxo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9509f3f1763ab470f31b990f1c1a12c4/5996745478.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/xuzunefep.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/vewobilugusowuf.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/19522104093.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/besajorixed.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/biwopasolulizuro.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/fb90e9a08cb2981d3f9eafad2714cd70/sorutipizosaletukape.pdfIn PDF document text
    • https://ivanamihic.com//files/30272477212.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/87274851696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=modifier+un+pdf+en+ligne+textePDF 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_off0000cb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB01 19216 bytes
SHA-256: f6057f807d2170066504947e4aa80c3b15299a7010ea666d203df605f11b2f0b
font_01_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 10540 bytes
SHA-256: fa7b75617644e6a95f86ab3a822c77189f54fb825fef1e784a36292b591271eb
font_02_sfnt_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1