Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e3f4b7f79db49d9…

MALICIOUS

PDF

76.9 KB Created: 2021-07-26 19:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4a8a7d74e1dd3df06064c5386c90062b SHA-1: d172893a7fcab7859339acd9c2a682600bb5f2c2 SHA-256: 0e3f4b7f79db49d9c4ed8effb8e6b33708c1e27487eb2cc9aa90b5a615572fcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS upload directories or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of using such sites for malicious redirection, likely for phishing or malware delivery. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dlmberatung.ch/userfiles/files/fokusig.pdf In PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/afff0693ed6153f021f78db31ca0026c/kagewagego.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075f13fb4fdc---10105234278.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/9782099394.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/44147367129.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/enefileni.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/befef1020219383449d80d12a0598d78/nivesuwezifisixij.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/86548743281.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbb10059c---88166307476.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/jawagogodajubinobepipow.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/63486773021.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/poxur.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/ragukidijajagavoseza.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/dafulanemupizolajobo.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/karotifetabojikamifokoves.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acbaed0a7c---febiru.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/pujqesrlen26oeuefuvoj4s6mj/76842229922.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a448edb612f---19695023350.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/k8dosogcjhs5apa1u30nmi2k91/35383785885.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/739fa2f449711fcbee12e4a1888ea5eb/somilijagawotemor.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/pazasetedezagidaxuwafexa.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/18312401541.pdfIn PDF document text
    • http://banquat.com/userfiles/files/popir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ek+tera+naam+hai+sacha+song+downloadPDF 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_off0000c7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F1 10976 bytes
SHA-256: 7ab6ddd88460a1039ad1fcf62630cdeb54cc3721f44e24bb90a0019b35eb3053
font_01_sfnt_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 16980 bytes
SHA-256: fe6d194fe6180e9d3c3d9bb783866a75d959bdd3d785728ef508db7177019f95

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