Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68ddd267ef16444…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 09:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aec34ba5e6a4057005dee4f1053db0f2 SHA-1: 64bfb52bbaf5ddbb2c477c8d4f26ac38ae79c0f4 SHA-256: c68ddd267ef16444c2a0a907cd105b48fde85a43f9f63c76b95111c6d4b5356c
116 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic suggests a potential callback phishing or tech-support scam context, although the document body itself is heavily obfuscated and unreadable. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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://irlanc.ru/uplcv?utm_term=android+contacts+groups+missing PDF link annotation
    • https://gopherscopes.com/userfiles/file/46368929331.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/10334971758.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/laragekonifofonidapafem.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138462bd9cab---faguparirimudozuvivo.pdfIn PDF document text
    • https://best-label.com/upload/files/xasixibuzojas.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/sevano.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/surogigazivi.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/pewowi.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/ledonamipoxulezefowam.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/mitetefeno.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/vakiwaju.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/tinerapididadibalaxa.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137d27857990---sujofenurula.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/24724065224.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/vazemovupekepejo.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210901132127.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141126deac09---wusitatu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614142010cc29---fululorililuvoga.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/86161934371.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/bozevukoxemerevaf.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/gijemukuf.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/14789633045.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e28d41e06---samabud.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/41973158870.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_off0000d53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53C 10760 bytes
SHA-256: 7bc62ddc0ea2447a8292cddc1596f459a8044f5c102903a9c55f7317b760a300
font_01_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 17208 bytes
SHA-256: 0384b155330258ce701b7898232709879469fffa490d2e0470a69cc77736d678
font_02_sfnt_off00011ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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