Malicious PDF — malware analysis report

Static analysis result for SHA-256 c932279d105b4492…

MALICIOUS

PDF

89.5 KB Created: 2021-09-14 04:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a6c9a0e3284175cffeaf89f31165d37 SHA-1: 86bfbbbdc26bd5c8b1f07c7e0487212c0d6de1ee SHA-256: c932279d105b44926a1ae2ee9177a7d90e583b7036de0e81dcf86a0a813437b7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://giovanniseneca.eu/userfiles/files/nabiravedira.pdf In PDF document text
    • http://osayit.com/images/file/59440045721.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/77021324639.pdfIn PDF document text
    • https://amgaa.org/temp/files/mujuvi.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/35092164481.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/73280963911.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/kajebokujalawexap.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/fajimodexuzodebonib.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c6c37a13b---domegolirazorukupona.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/25682190940.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/jines.pdfIn PDF document text
    • https://fong-cai.com/upload/files/74450473462.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/85675543995.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/3ttd8oj5ro0dsp9602lb7u3a4u/55398621827.pdfIn PDF document text
    • http://spiregene.com/image/files/20210905_064424.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/75465466908.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/60934216787.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/rixesakew.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/29364981444.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/5205315744.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d6366f30---39656433164.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/63083713169.pdfIn PDF document text
    • http://pedraferro.com/files/files/gikimebovaveketinigaj.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/56836341118.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/50290204121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=list+of+goddessesPDF 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_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 10072 bytes
SHA-256: 4a0107d2c13de0d750a0fe2293864927b41368b67c963f2f6188070c7da9aee2
font_01_sfnt_off0001110e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12920 18048 bytes
SHA-256: 0b21ea8fb88b4168dddbe28278937dc85aca2838d8df110e6f68ba26a18a8655