Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfd78ae4992cf3d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 05:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f56cea5a7bb3de32be9994d88f30b958 SHA-1: 2a7f887848b7ea06b11828d3159bde39f0b05af7 SHA-256: 1bfd78ae4992cf3d80dde2dbc228898594dba610b7cf917496b2ecc4d8ac1edc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple suspicious URLs hosted on compromised or disposable domains. The presence of external URI heuristics and link farm detection rules strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=live+cricket+hd+app+for+pc PDF link annotation
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/83645484650.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/86018606528.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/89462669817.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/42620486912.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/somozuxixigolexun.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/70526472105.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/47499116529.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613992f4965cb---busovaxedalixuwijimonaw.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/72352252709.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a5d3b4494a23ebe4835066eeb867ea6c/19412041578.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/bifitimuvagiraga.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/281ad1e5239ba70fa8121c7b49b28dba/65251269716.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/77089500630.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136866010776---lasoluligo.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/92111161381.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/54377713936.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/refolijipi.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/93998699407.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210915_152016.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210916_2207704CCE719072.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/nitiwexu.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/karivazotovanepewidoxipim.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614099160120d---sapilosudejiwuge.pdfIn PDF document text
    • 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_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 10516 bytes
SHA-256: 22668bca428d7354fe511eab02ed2c40c82809802eed72290d4fb66d7d54b5d6
font_01_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 17216 bytes
SHA-256: d0775ab6b4fddcdb2b5aaf3bbaf19d691937aaa34b66a6d0b9c2fb155972e236

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