Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2c351c51db1d50…

MALICIOUS

PDF

90.1 KB Created: 2021-07-07 18:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c65b19eb682d633b36585ade788d1a2d SHA-1: 58c75eb595d5c027a244c0992ccec71c4c40637f SHA-256: 4c2c351c51db1d50ab2bbd3ea394cc6fc7a922133b280d39ce43241cfae05174
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://philabc.ru/uplcv?utm_term=dream+of+flying+fish
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h0c8ae773qr2i4e7i1h1nlauo2/zareletafamaviwut.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f9b8ade5d---3472682166.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/h2midslru509ndbp661jf0p0kt/29475322121.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160720a19557bb---nufopobofusunuko.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/t6l7cc5qohho3f5vssaj1b5ouk/9873566495.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074307a9f30a---papuzubujuvalojisoretose.pdf
    • http://gistys.com/userfiles/file/kuletovekozobeferujubo.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4fc1f1c53---67577886921.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dc64eef97472886a9bfa4bf736d9d168/selomowadunabaz.pdf
    • http://kpghomerepairs.com/uploads/image/files/sovodipiw.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779730ea042---filobosuwabatadojamuli.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077098b3ac0a---58683664362.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/fdb3ff6c6ebd05d50c5d467aeff4042c/80168395457.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/fm7l1qol3o2iqpob9n8cb9p3ol/5979850232.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfbaf27fed---11868791046.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/7j3gll601l5vrtet87hr4gj56t/tunuzusigene.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc87381d0---fozuvurelatinepelukemen.pdf
    • http://cncforginghammer.com/d/files/zonifibiziwapubijo.pdf
    • http://hainescentreasia.com/images/file/35665348505.pdf
    • http://curry-box-deluxe.de/userfiles/file/22912659450.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609055e32f972---83549855722.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1021b13d8---rovapepavubizokewevis.pdf
    • http://dermalab.pl/userfiles/file/vutotudux.pdf
    • 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_off0000fd26.bin
727e81f9408a62cf01d5bc96c54831e14c9bb14e016f3d6214cd43ed4c55f463		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 17808 bytes
font_01_sfnt_off00012b31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B31 16792 bytes
font_02_sfnt_off00014348.bin
db202af9cf31db58babe438ab6023f04b2a2914389a2a68a5a07239d90d872dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14348 10680 bytes

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