Malicious PDF — malware analysis report

Static analysis result for SHA-256 222f410cd5c441d9…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 20:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ffc32ff4280b3ffbeba157cd467c7c7 SHA-1: f2ccf059cfdb80c58bdd4da5871251108cac259c SHA-256: 222f410cd5c441d993634ed0278812a8c6ff456d66c999a957c9ac977ea1e347
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content, further supporting a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df869c77ac1---vunanitenorobipugaxewokud.pdf In PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/kororaxesaper.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/6fb89vsmnodevekdmi7a80ee4b/64336420072.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/samegagi.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/50105743353.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/347e8ed68793faa73259fea53efb858b/riboditebuzalim.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/01b4135afff0a389e09980f87ff35be4/tutitesori.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/051ff176ef7de5bf597f6bf2fcea0abc/63248032042.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/29039024500.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/gusapidezapewodagatukene.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/50679732321.pdfIn PDF document text
    • http://soflcops.com/clients/83267/File/vipuxoto.pdfIn PDF document text
    • http://klinok-saintp.ru/files/11089138833.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/24994498727.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fd942c1e2---dekipupofemagam.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/tusojedow.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084a14f83304---xigekesadasuk.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/jizuzokirabig.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/bazotubekajafegav.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/70097307671.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/pomazikowuvazemo.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/67435878671.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d10e815c32---suranudumepudupelodowixi.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec0de451cc---9517505346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=verbs+with+prepositions+exercises+with+answers+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_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 18896 bytes
SHA-256: f89ae6d19db6c59d21c7cf0e1251b25695292fddd966fd18167a2f420f153789
font_02_sfnt_off000125ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125ED 10968 bytes
SHA-256: b5ab83438f36efdee688f01798bb77b50c4b84b5d9d6b574e80e8089ad2652fb