Malicious PDF — malware analysis report

Static analysis result for SHA-256 94924d84c10868c4…

MALICIOUS

PDF

88.4 KB Created: 2021-06-27 20:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: de722b247c12fb55b825f4b069259977 SHA-1: afa21d107983eea4353770c3c7d38ebf077d47a4 SHA-256: 94924d84c10868c43950542dd0bd58cda337bd5085653a4333aa3ef83bbbfef3
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics point to the document being a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The presence of external URIs and IP literal addresses suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/05f215fa7d4cca19ad2983c4d3eb21d7/26871609942.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee09c17de6---5616652280.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/lijadolowemax.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/78q181m19a3fvhops9q7kitpcp/xebadez.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cddb4ca295---gikeri.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/566622c9390470e73af6559eebf3a506/relizorubupejode.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160746ffa38264---legekenifutomudokepa.pdfPDF link annotation
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/xivuriluj.pdfIn PDF document text
    • http://abnicum.com/files/file/12052102358.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/11570840bad87c67978fa7f5814afc40/49439913624.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/21a298159677ce14c1a2ba0a5fddc3fc/57202070167.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/namuzakowatokufafetiguxo.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/85b04d480adee2fb977ea2616144a929/vuwifojefosidakasopasavem.pdfIn PDF document text
    • http://aweibel.com/Photo/file/17893742900.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/g2d8hfb160mbhg8dkb12sui41h/28832939900.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/1llng004r9cja8odnltgku1adp/72349315759.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/83482596277.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0770895303---tabegofidugurono.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5a2e11878---puwozirunegowuneregozo.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/1cd16f7eb26be92897d069b25a669cfd/21898998006.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/wajifonavamozigoditi.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/b02f134bd2b56fd82582619236e6bfc1/dubududekekalowimat.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/4669b4d4765125209892f0718ab73457/xesirugabet.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078439f47770---27206480691.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/7def7398d291568978339936dfd1f8c7/437664920.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/dipulalodunefepasap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=air+force+advanced+enlistmentPDF link annotation
    • 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_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 17588 bytes
SHA-256: 2703afeba6162887ff5a824d2cc4d3e978729a9ccc2e770186c9a655f9e76cd4
font_01_sfnt_off000123b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B8 10684 bytes
SHA-256: 50099ab145129b697d4b09b04dccb20bed1388cec99f793e37e4242b49e71b30
font_02_sfnt_off00013c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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