Malicious PDF — malware analysis report

Static analysis result for SHA-256 122ced2c5d2a4d74…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 14:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 68e839be3d4a5b0a2659d1a33469cd3e SHA-1: db635a377c43b7e898c8d3d1cd010dc194bf4849 SHA-256: 122ced2c5d2a4d74cacba657a794ef585a741520ff5ec42662d307e17aece1bb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's an image-only lure designed to trick users into clicking a link. The document body is heavily obfuscated, but the presence of numerous external URIs, many hosted on compromised WordPress sites or disposable domains, strongly suggests a phishing or malware distribution campaign. The primary attack vector appears to be users being tricked into clicking one of the embedded links, which likely leads to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://laborke.ru/uplcv?utm_term=android+kunjappan+full+movie+free+download PDF link annotation
    • http://cssh.es/img/file/34619259521.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/merosifo.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/xalokebuxewidapasi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/6f5b926eeb313d035b25dff10fbe8feb/jexegatifamuroxuz.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/6520312789.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/1891330618.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/firejimufak.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/kojelibagina.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/nomusutised.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/wamojugefudebi.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/42626798928.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/17828308665.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/86846713868.pdfIn PDF document text
    • https://jin-ji.com/upload/files/44071395377.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/83330911445.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/14533396297.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/patonimuvubevomufer.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/xijimigujosofuniranide.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/62946557261.pdfIn PDF document text
    • http://kd-council.com/upfile/files/45505611885.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/kumusomefisolez.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d52aeef212---3162858314.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/038kj1mjor2c673i610868m3ge/tofijax.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_off0000b03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84C 13920 bytes
SHA-256: 97e7375ad046638fdd65c8f1844f852b1c7f416f7fa24e6cbbc5db22032d282b
font_02_sfnt_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 10848 bytes
SHA-256: 325636c9e4c452427b584cccd0b0d1c0a6a029d288f93931dba0d208d7eb59ce

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