Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c196a9dca377154…

MALICIOUS

PDF

79.3 KB Created: 2021-08-07 08:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a293e018eb475eb3daf01df712319fac SHA-1: d3517c945f6f31eb117181752c5ec8d3e65559c9 SHA-256: 8c196a9dca377154878a17cdc054c28fd45427878487cdcfc964bcf126e8f4e9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=american+reunion+tamil+dubbed+movie+download+tamilrockers PDF link annotation
    • https://businessservicesuk.com/userfiles/file/ditinabuwurofawepugodixom.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160734053ec9dc---defapefetinunab.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d4488741b---6517421337.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e35143e5315---lenosorufer.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/xivone.pdfIn PDF document text
    • http://chinalabware.ru/d/files/fojasuzojawixe.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/hp76svuq4ep7q7ilrjsk228lju/kenobomogopawog.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/fowupesewisipiw.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160de25d16d605---zewuzafizerebenomarafe.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/efteo93n44tgptjlpt8ech55p0/pufigarosuxibatesuten.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e71a1f5490178306dedcd889b293ec78/83582814284.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/7528ff135e0a1d6807a24bfc13d9f94e/xufagafogibi.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/literavetizipolasav.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/28539594661.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b9517d81---badixoxaverumiwirige.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f8b11f27---69804606986.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d8c6503f8---11678058228.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/kcsl07lqeb8q7gbb7m30c54q6m/32126013548.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608259469a3f0---33849916077.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/67790347567.pdfIn PDF document text
    • http://splogservice.ru/content/file/59082940421.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/tupugotoriwoxafufuj.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/sojuxelofizowiv.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d0bd29e0---kuwetugamedofedowij.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 17048 bytes
SHA-256: 0a1c8b23444ee84156021c5ba5c26fe50d28516fc9fcb76e6269b1a5b1bbb91f
font_02_sfnt_off000115f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 10996 bytes
SHA-256: c597d3c3b1fb6d00d70135bd1f6fd331e359adb96308c03076243c31e5e0b65a

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