Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ec11ca9b0d7306…

MALICIOUS

PDF

88.3 KB Created: 2021-06-26 14:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b26447731ef24c7835c9a550f9a78db SHA-1: 1df2c4052207698f75b3ea1d4f822bf556002d40 SHA-256: d2ec11ca9b0d7306fd3ac29fa63dab34cf11f792d10f5d079e3f64a2fcfe1be0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing activities. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8ace8f36---fagadis.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/04517707fb38ea22a2bf55d5a45fc1bf/56838017086.pdf
    • http://aite-materials.com/upfiles/file/nujok.pdf
    • http://quangcaosms.org/media/ftp/file/91992284451.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/5c9995c29f77bbb8474fc47b43f7755c/51840370709.pdf
    • https://eviinstall.com/userfiles/files/52997233029.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c87fea6805---39100866803.pdf
    • http://arabic.cz/ckfinder/userfiles/files/lafofabuxof.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/2d2losf4g28rd6pt055er01gc4/vojekopikivitaduko.pdf
    • http://www.nomorcantikjoss.com/file/74199363800.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083262490496---wuwub.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8d345e2e0fe37f8673b6d4a99a0a40d3/motebupof.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b54b090a31c93e755c41a4dfb77c187/girijufekot.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d32eefca54a---12986843617.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/9abd9bd23d82cbccca42c9633789405e/mukaguke.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/240f1266ef920dce58a54cff0e2bbc17/82850004764.pdf
    • https://sukhayurveda.in/userfiles/file/4498506064.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c544eea9601---12443717770.pdf
    • http://sushi-belovo.ru/files/1728931353.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/48550767133.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946116a763e---8220695874.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6d7fa427ea75f330be0268bbe314056/8537877853.pdf
    • http://progfin.pl/userfiles/file/tamodoza.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bmi+category+table
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f85e.bin
8e0a65fdb9c7c32e3247a80aae0381a267603ad6fae04172729816e7428ed987
pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 16648 bytes
font_01_sfnt_off00012399.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12399 16792 bytes
font_02_sfnt_off00013bb0.bin
5629b06ff2e5959f6a1b3d3a73660e869dae5527ae7714e4cf5860a97311e240
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB0 10608 bytes