Malicious PDF — malware analysis report

Static analysis result for SHA-256 7880ee47e7b49440…

MALICIOUS

PDF

95.2 KB Created: 2021-09-16 01:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cac2102d87f7c1745284f57559c2db7a SHA-1: 120fea647f5b45304b001dbf36c3655a6fdf5d60 SHA-256: 7880ee47e7b4944047cd34f2f72f4ecb7b2f1ff36ebd08f6991f8b6ab7e8ed65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure suggest it is intended to exploit users via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 https://irlanc.ru/uplcv?utm_term=iphone+11+free+music+app PDF link annotation
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/933315cfb01fc00c34ae161aa8d86fbc/vepak.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/rafekufixavulimip.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/rogovagilu.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/79512081063.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/pinafaka.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134310814b9d---beleguwalaxa.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/tinokonakifajusaso.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/48749666841.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79617743294.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/jefuj.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/gmq979iostsophgble1dbk8fv0/nibuvidopaputalozizasebeb.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/68405543581.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/831239366.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/nototumerejunov.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/31612843727.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/roxitiveleviduzojurir.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/74263458661.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/66596744188.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/37627424178.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/87645588733.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c3fe41d6770aa01a5259f253d1fcdda/9709670747.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f223b818---34494775521.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/79765891461.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613a6ab6b8acd.pdfIn PDF document text
    • http://getvisa.ru/images/File/90578897684.pdfIn PDF document text
    • https://ienter.bg/files/64294191048.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_off00010f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12785 10704 bytes
SHA-256: d62aab68e870794762c6d48df39c8dbdfb20dfd4a25df35345cd5174918b4b60
font_02_sfnt_off00013fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEF 17964 bytes
SHA-256: 375effb5d4cade44b3e4b8a3fe593a5d6f0de353fac2340abf80fed0bfce3dec

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