Malicious PDF — malware analysis report

Static analysis result for SHA-256 300c696352766a4e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 03:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 01b179764a58554ca13fbc18bbd60257 SHA-1: 6737beb62a3d00775aeed79f7ae19b97647010ea SHA-256: 300c696352766a4ec2f3756ee27a6e4e0e9c2793beb514a53dd183ff011ac2d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to compromised websites and disposable hosting, likely to distribute further malicious content or phish users. The presence of external URIs and the nature of the link farm suggest an attempt to redirect users to malicious sites, potentially for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://srsheicha.com/uploadfile/file/tizewik.pdf In PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160da0e2cf08b7---nabemisurinabavujaja.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210907_153259.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef28ac89b2---7025803347.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161396f97705f2---jojifopagel.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/85715836468.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/moran.pdfIn PDF document text
    • https://nexusmediation.nl/files/13422686507.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/zurovam.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/valoramigutukalami.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109011655367502.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/womipanufatili.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/73095192740.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f78ac46537---nesowuzujigadavoleni.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/76876912025.pdfIn PDF document text
    • http://gapp.fr/medias/files/wukotipebixekaxud.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/pulelel.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/nenegujojusaleki.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/kivobodalin.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/zoxewi.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435fba21fb2---ratalid.pdfIn PDF document text
    • https://cowik.pl/upload/wusawo.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/bukegoza.pdfIn PDF document text
    • http://carcable-bg.com/uploads/pictures/files/kewoxo.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b64a7d291f---6009076414.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/15048172387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=wifi+password+from+mobilePDF 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_off0000da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 17516 bytes
SHA-256: b57af7bbab7bdd6567125d56eec1ee502494ef06026f62ffd29141a6e275ce65
font_01_sfnt_off000107a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 10676 bytes
SHA-256: ed992664b900050a1fe0665c0d19999f6b7c6a1f161bea802834b4d1a12ebe54
font_02_sfnt_off00011ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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