Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfba1fa2d222c22c…

MALICIOUS

PDF

76.7 KB Created: 2021-09-22 13:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 07b1ca49c8aa8deb610a081650566b56 SHA-1: 6f901e54e278fb854207b96a6808770ff416ee45 SHA-256: bfba1fa2d222c22c11149e807813040e52f3c2ad2927ac7d420e779a7b17442e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classification as malicious, along with heuristics for compromised CMS uploads and SEO link farms, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=android+alle+kontakte+auf+sim+speichern PDF link annotation
    • https://hatinhjobs.com/upload/files/74927417739.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/pumukekeroritikelatiwege.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1614af816016e0---94784682582.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/rokibusuruxokafenabud.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/34310892679.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/25953304527.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/20629698684.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3e95ac445---92247054182.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a727078dee659eac5b1a3534f3ec6d05/fuwofajilotejuperujemopuv.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/80972023490.pdfIn PDF document text
    • https://blgjad.com/upload/files/52063586359.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/84081436366.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/subomiju.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614315aeea090---tumemer.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/xujidixoburexiruk.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/kupumabatasal.pdfIn PDF document text
    • https://fishuntpesca.it/file/98536379739.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/kugifenosubudusipe.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/jonaj.pdfIn PDF document text
    • http://falerisztika.hu/tmp/sejelovidumotilene.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/25861389455.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_off0000c576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC576 11060 bytes
SHA-256: c93a3857498647cae966d14cc50540745e5ba330153c68f855cd930a5c720470
font_01_sfnt_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 18536 bytes
SHA-256: a4047945e8f07582086004f7b745fa782133c572ba60e03c4f991e520301fcf0
font_02_sfnt_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1