Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f8eb54355ebf8d…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 10:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e14ed0266a254e6be3659298d1cf38c SHA-1: 083d36f27b08304a85c4ff02c4a4e4b7fcd48309 SHA-256: 04f8eb54355ebf8dc25f6a6beb874cb6e3a6df64febc054d98e1810a52b2acfb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://thebankcardservices.com/uploads/files/gomusewulanor.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/eed0595580f42200a9169e60a59f71ec/rirapuduz.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/453e50812477979ddfec0876d66b73c3/83825815028.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1745d9b9352b721529648dcf694964c7/borenevefipe.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b0104d5df724881ae533289f4a6e9a6e/74095775405.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/efc462b498e75b7cfd94bb984b845014/92895806363.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b073692a9---weburosevopevevasopukin.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/walew.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d14b581d2ea02908c2f9c3109c05c624/zizepikajulakobikupil.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/femogu.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/65912886145.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/vabudakep.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/94064905179.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/bc046d77dc3d81a57105ae78834583c2/bipudazejugivotekup.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210617184958889398885.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/45434616373.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/sopumupav.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609520efd7412---83940816531.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021061015354770554.pdfIn PDF document text
    • https://plasy.com/uploads/file/92994597187.pdfIn PDF document text
    • https://alutat.com/data/file/kisukeberixinenokudopoto.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e676342d9e---fefan.pdfIn PDF document text
    • http://jarosi.hu/files/file/mominuveleforolu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff2aabf0fc---padavevav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tibialis+posterior+strengthening+exercises+pdfPDF 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_off0000bf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF29 11104 bytes
SHA-256: 855615fc0818bd17e707bae765583497d71c797a224717ca8a21a13a0564ddad
font_01_sfnt_off0000d897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 15236 bytes
SHA-256: 387f64e84b01254b7d5abe0ed76eb7da1c6ea7f816d7116a5387bd23c6b37195

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