Malicious PDF — malware analysis report

Static analysis result for SHA-256 70de843279f536c9…

MALICIOUS

PDF

78.8 KB Created: 2021-09-03 17:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72c49e3683d57487cb9ec21fe8cea0cf SHA-1: 930adda0aa570f058eacbf1b6c4be77eccfa0f7a SHA-256: 70de843279f536c9fb1f1efaf7c709c47d0028f01817c9dabb31c28a7f4b44ea
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to potentially compromised CMS uploads and disposable hosting. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, aiming to trick users into interacting with the provided links. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://angkagenap.com/contents//files/dolerederojozefo.pdf In PDF document text
    • https://vinamex.info/uploads/news_file/xilog.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/67769158192.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/fatuwuzivisefuvuwow.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b472e8b5fed---99305291817.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/dapivumipigonedup.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/jilanewemufofodubofosip.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/11888107872.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f8238a4c6---wilipenupukip.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa9654a03---95682429465.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dc649c87d---mosokizodenunumado.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/53060883184.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/abdfaaf87b5ddc60f3b058e6982efb8c/regumilojibu.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/womog.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/4876562219.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/98873512098.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/bokomipenu.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/fumojazivenukedegivu.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/4852795586.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/78774438571.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/83361481296.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-4/20210604203206639152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=right+to+education+act+2017+pdfPDF 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_off0000ce96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE96 11076 bytes
SHA-256: eea53048744bbd9f59cdbc72de08789bbd4df96e5f21f48998834dd2d2d6e3bf
font_01_sfnt_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 17764 bytes
SHA-256: b7e528f561024bc3c659a12c59abffad7a5db2095864a5f4d78f1f30a6b6c07b
font_02_sfnt_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.