Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf78f7fcfed88820…

MALICIOUS

PDF

86.1 KB Created: 2021-07-21 13:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c040fd43ee2e07b0a07d708076625f5 SHA-1: 08505bf1a5ed9f6bb6334fc86925a15166fd0e82 SHA-256: bf78f7fcfed8882009bb0d993c9e1b9b5e0634457fa3a121b2159ee69a6a1571
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to direct users to malicious content or phishing pages. No scripts were extracted, but the presence of numerous external links indicates a likely intent to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.anclupnapoli.it/userfiles/file/94655610950.pdf
    • http://sodrex.pl/userfiles/file/bibajeb.pdf
    • http://lafayetteconnections.com/clients/52818/File/44777427825.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d58d4334e---78311100383.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c690e7e929e01257c6d6ef779b598744/gazagagevipolisorurodajep.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/01c6af9f48ecf3f6706a1ed4c2641ad8/16614403469.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7c1di5tmj65obr6jncpmcsd9q6/lasatubuzexonebiwa.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607507eac62e3---baluvurujonexozug.pdf
    • http://praguetransfer.com/files/file/ripukubugesanubamugotufum.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f64bbabe490---90283249108.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b7e414039175bfbc769f8b9e8c9e2160/jiketujumalesonutoz.pdf
    • http://bmsorganica.com/userfiles/file/15905187929.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/4dtfe1rd538gbiqnkpkqu5g9p6/zabakudusazojaxasusirip.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lgcon5p8eee9gt88o1bn9rui53/rusageretupubad.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/9becacb4f7cb8d756d375229a95acc47/vijovatonedawozepasosumaj.pdf
    • http://ristoranteyuri2.com/userfiles/file/35695177641.pdf
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/pepibisokegur.pdf
    • http://daiichilogistics.com/uploads/news_file/gevopusuxewujuwoge.pdf
    • http://dedanskecasinoer.dk/userfiles/file/xivulotusovutez.pdf
    • http://physiotherapy-warwickshire.com/user_file/file/gezadar.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bc87903a0---57320518570.pdf
    • http://buchtel1967.com/clients/26382/File/natupuj.pdf
    • https://mamadona.ru/ckfinder/userfiles/files/gekinunazitatodivoletubez.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/1cd87d874577f7cd70790de9e862a67d/50239576475.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=energy+and+environmental+engineering+books+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_off0000eb98.bin
49c9fbb33991a24682ac0c0a3ec5a82f618234336e2f036d09b853f38738c9e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 17780 bytes
font_01_sfnt_off00011906.bin
6620a00268dd1ca96a43ccb594a9debd230566d237edd8fd516c8240bc10cf3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11906 11236 bytes
font_02_sfnt_off000132f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132F4 16792 bytes