Malicious PDF — malware analysis report

Static analysis result for SHA-256 1704db2328d01627…

MALICIOUS

PDF

89.8 KB Created: 2021-09-17 04:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e807c261ee7ab868a620ef42cf7ea05 SHA-1: e111d854e9701f08146532cda2ed28de077a90f4 SHA-256: 1704db2328d0162772694b964574be5a9b492f17f98c99de6e5e6a35590be44d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for SEO manipulation and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://debo-fit.be/userfiles/file///864083074.pdf In PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/gimogizutatudi.pdfIn PDF document text
    • http://sbcnepal.com/images/file/30517186975.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/63677994450.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/rolederixofikanixola.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/62974644526.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/52043175395.pdfIn PDF document text
    • http://taigesw.com/upload/files/puwuketexitazekirarawe.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/rekubikejigukuke.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/naradavonoxas.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/wuberemulovoxun.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421e6034de3---tipilisiwiraveka.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/fivotusomatavesev.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/kogavubivuniwipubuwaxop.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/39580305131.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f34744e555---40118244446.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/29749494148.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/38918877833.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/76386493305.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/3940142212.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/wedevetewomu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613620e0d1452---84632544630.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/76092052241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=app+per+scaricare+musica+gratis+da+youtube+androidPDF 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_off0000fa39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 11144 bytes
SHA-256: c6422e53853ffb8e6737670fb12aef2a71dff47706ebc5effae70b9b729adde2
font_01_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFF 17360 bytes
SHA-256: f4bb333b95866aeb251b277d87d759f1be63d27d2d72a11c4efeca50ff131f67

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