Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4843d842287530…

MALICIOUS

PDF

76.9 KB Created: 2021-08-31 07:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 423c4ab79fbd5ab190d1c4f4c3b8fd86 SHA-1: b02679ed8fd8b8a6903cdaaf700f10b56f9dd055 SHA-256: fd4843d842287530598e371c35adf3c2bc80457a13013534ed8c9b5933cc2a23
176 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://brezov-gaj.si/uporabnik/file/57323663976.pdf In PDF document text
    • http://bezagsecurity.cz/userfiles/40596888609.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/49482990467.pdfIn PDF document text
    • https://scalping.ir/data/files/file/79995144176.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/dolabaximezuvosudima.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fab9e80ac---topuvimujalezigi.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/dfa2c28f011c9c2c75345fbea13f1329/2927166120.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/722d7o5mrf6s04ehrga6f23rs3/pugolike.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210818071001.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/paxuzuzitilizitas.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/satibuzukixotamo.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/mexifupirajegumibosom.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/zafijulawalunazuze.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/96583089953.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a695cb5c219---buzinajewapunidulanud.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/84810304424.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/v3c55hvint7ukshqlge9oavah1/dofugadaxeroruwuled.pdfIn PDF document text
    • http://rurisnet.org/images/file/zobiwijanafegiditatuj.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086594c63b60---kexiposedenupibi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fac3bce096---jabigajorofuzonabe.pdfIn PDF document text
    • http://ozari-ua.com/files/file/16387197499.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/fe58746b5e3dd154af4feb3455e8bbb3/17448465866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=fractional+exponents+revisited+homework+answersPDF 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_off0000c6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E6 11100 bytes
SHA-256: 7e3d1e64c2096c6e3b1251d178a1490a8d65ab19ce9330fe171afb8cc0412321
font_01_sfnt_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 17400 bytes
SHA-256: f8e9b24f27e94c931d6f7cfc9ebbd931e80f61077262e02e40dda1e2dadde362

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