Malicious PDF — malware analysis report

Static analysis result for SHA-256 63170b99ebce8edc…

MALICIOUS

PDF

88.4 KB Created: 2021-07-06 05:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff096bfb1030b7bf690ec0d33114e59b SHA-1: 8fe9eedcbfd63469be8c62b1dba2ca9ac629b780 SHA-256: 63170b99ebce8edcb86f6c4d910ed6fef8c7e20d61899cac62c13757a26611cf
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 for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other potentially malicious PDF files. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be phishing or malware distribution through a network of compromised 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 https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/6092ntld4tgb1k1qislfu952na/fozor.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082be1d60f18---62706184740.pdf
    • http://charontrade.hu/data/file/ritudutiretojeleziw.pdf
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/93715701589.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/38359aeca9e23de8a8b6c16916e0b2c5/jojokakutaferavira.pdf
    • https://juhaszautovill.hu/userfiles/file/43587028939.pdf
    • https://aspaeng.com/files/image/files/5438595786.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073260c6a572---51567295251.pdf
    • https://aawyx.com/sites/default/imageuser/file/sipepejexabumudivukudubog.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f1f6308ed04472769e1d687a3f91d340/rudagimatujeb.pdf
    • https://securitydm.com/slicice/file/notitabajon.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d1a55e70c453a0ef390502fababd5577/ledomapuvozax.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16077b015443f0---pujonopilos.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/0cd3804e5ad72f98e108258909f7e5a6/16452517183.pdf
    • https://telenovella-bg.com/files/62341975158.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbd42f34b9---tukuzelarojaguletoga.pdf
    • http://sacmacbook.net/userfiles/file/71564224652.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d60dc9050d---vupuwojubufukepo.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94c0be3db2---jizatu.pdf
    • https://combrooncom.com/contents//files/pamijuwunixekuvavebumu.pdf
    • http://uniroll.pl/user_images/file/filowefenavurolag.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ble518ig80rmub6b4itklcjbj2/29319685057.pdf
    • http://alnoorcity.com/userfiles/file/64782964444.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=project+management+interview+questions+and+answers+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_off0000f66c.bin
6133f77fdc34e67d090a2a676ab33d7d358de2834ca645dd13f13fc4120f8132
pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 16616 bytes
font_01_sfnt_off00012149.bin
e603dccb11a9d4db458e6124b4ce1026d2036a41d5760534f5812864caf22999
pdf-font-stream PDF embedded font (sfnt) at offset 0x12149 11448 bytes
font_02_sfnt_off00013bdc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDC 16792 bytes