Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c754d1f5db49f7c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 11:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f9470f30459a5a5515c42e3968c6ccc SHA-1: 7c37322b52b51008e9f4d67c51bba4fe80ed0528 SHA-256: 8c754d1f5db49f7c8271d4bc93ae9812274fae06caecbec55d224f2a7130a2af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f1985db52ca---jejogatu.pdf In PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777131bd826---moxafuzutavozup.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/533c7e4141fc7ba6a21b9bd8910f5c0b/70744057098.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/84677833119.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/timibelozadimakepo.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/92440648715.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/25256679959.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/xapizepuse.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0rfstgf8vtdcv8vjj0uahct5c6/muretobax.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/sorixidoguburepapiwijifis.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/2590774675.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nrtnt24jjpdo94h4d8pfelah43/67629933628.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/68034933667.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/10187746877.pdfIn PDF document text
    • http://elm3rad.comfile/79647532664.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/pasoxipomedesijadipo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ad29706e---sopubazefovol.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609be4899cb47---ruludebojonibogenojefa.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/julitap.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56da094862---1486544542.pdfIn PDF document text
    • https://nasikampung.info/contents/files/mogixifigiganezeke.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/98129435487.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8a8f42a49e94652e9f85f16559c5bba6/85454859568.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/da6a4d1b0ff5c855560dbe3bb3cb4ef3/67347737686.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/dedatogawu.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161210f2bd3d3f---xexiputupiroved.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=influencing+and+persuasion+skills+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_off0000d208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD208 10840 bytes
SHA-256: a0d3ff6bb438fcae1cab9eb61bec06f7766eb9a3064b7434ce29ccb285a405a9
font_01_sfnt_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 17672 bytes
SHA-256: bd4f73b3ace52a5a003003b0e4ea4fed0e2c515a3bee7d4f262e6bd25a4a2b8b

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