Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36a9ba353541357…

MALICIOUS

PDF

87.7 KB Created: 2021-07-13 20:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 66423376517c778cc3bf0319882e0799 SHA-1: cf6a3279b42e85c04b0c033efe5d5cd88e47ab10 SHA-256: f36a9ba3535413571499d9267b56ec6ca2574b83beb6e192582cbf80b2d93e6a
158 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URI indicators and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser exited -15. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://nomylo.ru/uplcv?utm_term=vomiting+bile+after+drinking PDF link annotation
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abd5a8c16d---lumoravewumilebere.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8c621e19896b85e3b790eb1123d73c4c/66086435299.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/62009005555.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/16503794390.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/e199lqv172t4js4icen7tq69qa/valebetipuni.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607bc7efc48e9---gutateni.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/ganodinazuxewipotug.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/fifujesagudumabi.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/55868522120.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/bba3d94664ba827d8abf0075506a2050/98151961241.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/vum3dq5f7fhc2564uv4228v5ql/4016451579.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/666sbrfja0ok3jnp23sjsrad30/14604387925.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/xabegabon.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e20d508be2---budinaluzid.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/jediweneresolexowisabomen.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/31232945574.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160901d24a22eb---lawixisoworumiwo.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/lj5akuvqntjcmp4u359shmnds3/gosamomukusomupifigagi.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b55e3a5919a---37195623450.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/wakiwonokipir.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_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 10728 bytes
SHA-256: 5a92036949bfb8f24cc9fb62345829a2e23456443ec6fe626ace999b925313b8
font_01_sfnt_off00010cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CC 17360 bytes
SHA-256: f8bee8abeb593f4d6ff75d10c4eb6b3af568c0f5d8d323c444a8993619d7092d

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