Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02325e34f234ac6…

MALICIOUS

PDF

89.2 KB Created: 2021-08-13 23:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33a92438fe3e8862cffbe5b4312fdf66 SHA-1: 9192c39a4a057134fe6a8449b8e505f795337392 SHA-256: c02325e34f234ac639dc371100e0a8e641d70a9c2c8bd218f5a6914784c86e67
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to evade initial security scans. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware delivery attempt.

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 https://krisoc.ru/uplcv?utm_term=terraria+inventory+editor+download+free PDF link annotation
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3a7d814fb8013bf265e3bb75bf1e8275/32070693968.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/14961368463.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/xolopujelalanimebud.pdfIn PDF document text
    • http://vuason.vn/upload/files/baxizupiwemebejad.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ee2d60e1---xasoninavubufap.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/57990720841.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/20008428902.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/ninutebipeboruxuvinuwuze.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/81078970055.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106d4db2a55d---81060192933.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e0fae7a27---mowemivumizerewuguribus.pdfIn PDF document text
    • http://strandedtattoo.net/file/77196473783.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/62912243000.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/236e1c20bd0a13578f2952ff609b1166/3733254495.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/87618747674.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/29652875459.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/xabiponurajagofojov.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6bc8b441595f5d2c5b9daf2cfab3827f/vurisofetig.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/e9ffb78b7988bbb1b69f525ad5be292c/kebepebakib.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f31f0141ef9---7578441519.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/77370902657.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109ea5bf1616---90684288677.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/85724559890.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1c52293a---nilazul.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_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 18264 bytes
SHA-256: 0b3d2b2001e08d916f1917155983aa8cdf4d9e63d9bee8331134c6f116018e17
font_01_sfnt_off00012657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6E 10408 bytes
SHA-256: 49bbb7bd1309b8ef3458b0f83578023948484eda0b8ff280f946bfee504c6e0f

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