Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f55a142733fdbc…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 03:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c344b162e9ae72b3efd3f2a5343fab42 SHA-1: 84788ff9dc3747d7bc500b41353b5587e62cc085 SHA-256: f2f55a142733fdbcfbeb48a226c762b6b237a09187d85f65e156fedbf3bc5530
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it is a link farm and a callback phishing lure, specifically directing users to a Google customer service number. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the document's structure and embedded URLs point towards a social engineering attack designed to trick the user into initiating contact, likely for a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://terwaarde.be/ckfinder/userfiles/files/34240028931.pdf In PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/23b55706f15cb58cf8762f952107d4d4/susak.pdfIn PDF document text
    • http://premo.at/userfiles/file/sozuwaxobetow.pdfIn PDF document text
    • http://hrudolf.com/userfiles/60492664221.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/voduvapem.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/49705098010.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/fipenixoxura.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/5349907458.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/xolibora.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/vosagiko.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614029ae96813---29681433296.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/6268480396.pdfIn PDF document text
    • https://kultmotor.hu/images/files/9000878245.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/lasutuxe.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ai2am2qc684kfqqtr8s3blfdq3/berosesulekulidajemu.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/28175141228.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/rixobipavobuwetozax.pdfIn PDF document text
    • https://path.mn/userfiles/files/kogon.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/faxajexo.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/73891967485.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/sudikudubanakiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=google+customer+service+numberPDF 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_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 18000 bytes
SHA-256: 98456e74de8bd633bcd950f98bf00af5be82af4177b931de37ece09200b2569d
font_01_sfnt_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12749 10756 bytes
SHA-256: 6b1340e370f3d9a6809c7ca0311064203ed82425c0963a62c5f7a684d4fb1322

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