Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6aa7d7c91fd243…

MALICIOUS

PDF

82.7 KB Created: 2021-08-23 12:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36a8628c917464d0af4b83fdd05e4e49 SHA-1: 642172b925656af1af6b707b53284d0bcdd3f084 SHA-256: 4f6aa7d7c91fd243a5d7770bff4bd1fd63815292c02e681fc403e0053ba2c63c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting an intent to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and potentially distribute phishing lures or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lomojekevukepufatu.pdf
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/c669694332484224c1b9a37720391077/wenowimovejinuduriw.pdf
    • http://kapfenberger-schuetzenverein.at/userfiles/file/fatixabazozog.pdf
    • http://yossy.biz/userfiles/file/19137569355.pdf
    • http://asupuro.com/upload/save_image/files/54183765881.pdf
    • http://thegioioto.store/upload/files/xivevenesolozadafawaralet.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/n827lc3tu44hkabulvmia7megg/77335384082.pdf
    • https://hondamienbac.vn/userfiles/file/53772839539.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/781c1d5d39eaf00896807e2870411d2a/47219791474.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608234b521455---takerizaxuwowes.pdf
    • http://cbcom.fr/ressource/site-image/files/91080282518.pdf
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/gomaromovozaxosewokenofa.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987aba3bdfa---19661365539.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/30a7c07f4d03a261cb46f32125f67aed/fesifofakanen.pdf
    • https://namratalakhotia.com/userfiles/files/mapewo.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16076d6f5e6b77---54262853554.pdf
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69774465465.pdf
    • http://cokhihoaiduc.com/uploads/files/76224997702.pdf
    • http://asijskepotraviny.cz/files/file/33039406194.pdf
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/zigagupejofup.pdf
    • https://acgroupenterprise.com/userfiles/file/luxezubinav.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a7531ae6---46883581495.pdf
    • https://cowichanseniors.ca/userfiles/file/97919056708.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bf8a995ea66f1b2a1053318dc0134dc9/36938632805.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tell+me+about+yourself+hr+interview
    • 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_off0000e0e8.bin
c7f7073feb054df1cab123484aa0ed18288b62b03dd1bd3744924c4afd2418fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 10948 bytes
font_01_sfnt_off0000fa2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 16792 bytes
font_02_sfnt_off0001123c.bin
d84fe4fd7684cabdd4a22b767dcbe5299b30072f0410bca553bcae6992160f45
pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 16168 bytes