Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd3d10b7b73d7be…

MALICIOUS

PDF

94.3 KB Created: 2021-09-18 18:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7114a2e0375c38b88f00715ebd9997c6 SHA-1: c624808704a37892117b2df1bd5d6f5a680413a2 SHA-256: ddd3d10b7b73d7be062d95a400fe2efccfac07b83d1c1411a11247791bc3c65a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://oniceh.ru/uplcv?utm_term=breaking+bad+season+2+parent+directory+index PDF link annotation
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630508545/files/gesafivimupokojunulobedul.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/80443628043.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/31990940235.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109172112179534.pdfIn PDF document text
    • http://reopen911.info/media/file/fanuxafep.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/16ac22cb03338579378a6e5a8f176fed/rezatipapiga.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/wubulus.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/niwezumifarajusibe.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/sezosuzeg.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/65470508955.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/50074357190.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/xezadezevozuditufelotamo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0ea81478b81673896b5ab2b738162f07/kekiji.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/12333837414.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9596949624.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/dukepigesamabogejeg.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/28281386018.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f81db9dbe---sidonoxapi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7fa50dfa47eee039c58622a323e2f63a/99853882674.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/voneduwezepefijano.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/sozifinugolob.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/28828966097.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437f6d5b9ea---66889588992.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/16189324105.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://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_off0001012c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 23024 bytes
SHA-256: 4f6aeac9905ba36509b5149741370ff47a89e7105805bf1a812a248b97021ebb
font_01_sfnt_off00013df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF2 11264 bytes
SHA-256: 3e11636dd3d47f77e5eb72aceff1030c8340fccea2f99c083785d5bada69b89c
font_02_sfnt_off00015838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1