Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14df27a49d301b0…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 13:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9356d3ce89ea2e3df30ccb2696cb6003 SHA-1: 0feb8bb73c21f78f5822c607879fedf09beb01eb SHA-256: c14df27a49d301b0c436205e68bc0fd1b8d9b39bf8b50f727fdd6d4f2d0601b1
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of a link farm on compromised infrastructure is a common tactic for distributing malicious payloads or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609850f87588b---12594458876.pdf In PDF document text
    • https://luyenthitoeic.info/userfiles/file/mobifenusubadisifu.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5errkvihf3ovg9r1h0dqn297ou/58829858065.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/kivevibufirajipeme.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/rb4hhdgig8nfj6b2sno3tkhp62/zorujevejagudinezurur.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/77571336520.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/82589337912.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/41334144981.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/xidoxut.pdfIn PDF document text
    • http://labradory.pl/file/sojak.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6028dc660---33552411837.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/38052500312.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/53514591406.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/49ada87f0cd4840ebc95b1fbb66d3026/pajowotib.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745b54b50e8---7337712500.pdfIn PDF document text
    • http://cortabellanews.com/userimages/wofuxajurufobupog.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612c2b60029f2---50858317759.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/fobenowetonufivedusuku.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d232f322998---61876929655.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/ximamukuz.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/35025897050.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/fri9tqeb2tmc9h6175k8bcol0i/vutikejokelunolazifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=auto+sync+in+tagalogPDF 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_off0000c48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 16272 bytes
SHA-256: 919378242b7acded7f6f6ecda71392c8ce7cec469c019fe43712aa6283360440
font_02_sfnt_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 10368 bytes
SHA-256: aa3a5b46c852ee4e7658e70952ddbc0843956e2594f79a0fc5a7f8b2615ddb06

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