Malicious PDF — malware analysis report

Static analysis result for SHA-256 53497dc14b244996…

MALICIOUS

PDF

100.0 KB Created: 2021-08-16 00:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d8648ef51ce9ec65999fd3508d502398 SHA-1: 94dc2135e31c95a45b2e9268c693824d298f6975 SHA-256: 53497dc14b244996ee02d8b901d145afbbaaec46d76e40d5393ea871e2ef8968
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for malicious purposes. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=%C3%BCstel+fonksiyon+tersi+%C3%A7%C3%B6z%C3%BCml%C3%BC+sorular PDF link annotation
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/grf2ldq9b5gadg3iaao1878bt0/96920901182.pdfIn PDF document text
    • http://goref.ru/files/file/58068393404.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/16711129765.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/xavilozi.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/iv5jh19gm7qb5u8oi1s0fn60ed/fejutivotaravokaledelu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842fd01cef4---zefuxefipekonamekowinife.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/xadevonewenebal.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/64197485298.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/87179435094.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/3bda2f937d4c5fa6585f5d9679ce8a6c/19035686575.pdfIn PDF document text
    • http://mobiliteit.nu/files/nesumovu.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6t61bbu21kdbr5hpg68hphvh9/xudisasazetawimowo.pdfIn PDF document text
    • https://cristalensi.com/public/File/47670926090.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67dc39b70---31044889093.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/duguwumoku.pdfIn PDF document text
    • https://retta-bg.com/userfiles/18556347734.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/27216930450.pdfIn PDF document text
    • http://zuche0551.com/upload/file/5979320980.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vhu5cdt2vetgqk14pmd9sjgkm2/xolemagezusibowixinoparaz.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a7ea0b89406---50131695759.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/gemq55rdjmp04e1kc27cks48gj/zefovaruwajomenop.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/46d8239ace463169299b8af64d117a65/nuroludoweduto.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/geh59mlupg2hpi7qnn4kblcgup/83560502271.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/15575280924.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2431f0fdd83abf7856c325f8312af333/47073868949.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160707ee5d91fc---lironiwovisivalexomef.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_off00011959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11959 11448 bytes
SHA-256: 9da5062ddb66c63d1dce860d2e134a191f771135991f1b2ad51f49eb3fb48204
font_01_sfnt_off00013371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13371 20656 bytes
SHA-256: 8b8294a9739f3ae3ba9bb4c2908064448cc95073ae19f5ed4593948fa450fac0
font_02_sfnt_off000166a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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