Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0a2f7d3c9027d3…

MALICIOUS

PDF

128.5 KB Created: 2021-07-23 23:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13e9e24b971d024ad433b5365eac676a SHA-1: 752a1d0fb245d92a1df3f3df1c6228f7063e0207 SHA-256: bc0a2f7d3c9027d39e8ee164a612e13ebcec17d7d16723b4926736a64fc14f33
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The primary attack pattern involves directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/055a7d0fa01f502c39414cbb8c51e6d5/56755802692.pdf
    • https://mancomunidadvaldizarbe.com/userfiles/files/fikaminukizesas.pdf
    • http://ahxxzx.com/userfiles/202107/file/lazoraxokipo.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7ea30104c---53542804656.pdf
    • http://ackerviewguesthouse.com/userfiles/file/70967887003.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/53a955ba9cdf9464a1439a57b09626db/37052199466.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01b411bb21---kizutirasatowesisigepa.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/4g6k85d17msi69mu8kl8s0o0hm/13122619126.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/ac93be5a044e91f67f82148ed2c9b1c9/64567208614.pdf
    • https://arerp.kr/data/file///rafodagizopetab.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d9acc8c49e0---nuteroniv.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/naladota.pdf
    • http://citywideok.com/clients/75789/File/tifatiduxutaxolifum.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9335b3acd9---vutezuwemuwagewutidim.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/88079560813.pdf
    • http://arcomproltd.com/userfiles/file/vuloxopupejefuwojow.pdf
    • http://playbabydoll.com/userfiles/file/zibiwesikakakitoturi.pdf
    • http://andrelandberg.com/userfiles/file/pokitixalaxe.pdf
    • http://verynailscm.com/user_img/file/94499097823.pdf
    • https://nnkcreations.com/userfiles/file/kiwabesodasofugiju.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=types+of+inoculation+techniques
    • 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_off000193d1.bin
0517fc915d99306a1284357bdbead3b45418a3fdd14df1a87c0c2ab34c61fa2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x193D1 10800 bytes
font_01_sfnt_off0001acb3.bin
3d295809a0ad2168950bd0fc8df0df93ab279b979fe1974fb7422ce0d45360aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACB3 17536 bytes
font_02_sfnt_off0001db10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB10 16792 bytes