Malicious PDF — malware analysis report

Static analysis result for SHA-256 94dd8cf6c58ab5ef…

MALICIOUS

PDF

86.4 KB Created: 2021-08-02 17:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 358e0bd5683f8972fd2952c36b68e55e SHA-1: 0a6c045b1607105efd5fbcde61fbaac44652dd37 SHA-256: 94dd8cf6c58ab5ef95447aaeec7673751e93370f1db37f5baf7f613451687321
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and other disposable hosting. The primary purpose appears to be directing users to external malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://drafthe.ru/uplcv?utm_term=how+much+to+feed+golden+retriever+puppy+royal+canin PDF link annotation
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb85fc11c49---lawuvov.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/48779551009.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gibopopoxuwugawigat.pdfIn PDF document text
    • http://cy2hand.com/userfiles/fovimazozeniruremenuguro.pdfIn PDF document text
    • https://miet.hu/kepek/34689227756.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/bigunopujizeb.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/dapewobiluvutizapawut.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/zatebuvutono.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/10571537495.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d36a8d116---rinabevisiso.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/0pf5keiou3d8b4rrpvo5ajqaru/4665407016.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/d76221a3a44a811bc2cc04a3d512e581/tujafifowizozenudan.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f934bfe0c68af08b4754a1ae9c11d08c/buxoxatamuxidugavepamuti.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/duvufiwulaxugep.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/91216948758.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/kuwugi.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/sizatizozepiresukudajib.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dfbb18e60---liboxakikusi.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079aab1c8ec3---zatogorabokonutu.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45689566166.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/61885559153.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5eda66f8268ec992e8dc14378d404e3d/gitugapofabezifazap.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/88306903da2610127f64d16d363bc1ff/kukiperalokozugoxabo.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/10659383061.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_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 16976 bytes
SHA-256: f4902da2cd48fdaf379cd9e7668f10af7a023012e182f180e0feadecee4b3820
font_01_sfnt_off000118b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C9 11256 bytes
SHA-256: e3cdafba7369752c52aa72c9af887f94fc5fe0b4006265db00e8c2e81acbfbca

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