Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb25a276378543d…

MALICIOUS

PDF

85.6 KB Created: 2021-06-30 17:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2f43bc4b2de4678d5369ab45909c0f00 SHA-1: 7fed69a8761bd285e6532306115f3c238782d085 SHA-256: cbb25a276378543dd6d3745ca52b3cbeb2b12780368cbb54e440a1c78cbb1728
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users. The PDF structure itself does not contain readable content, but the heuristics strongly suggest its purpose is to facilitate access to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d22186064---59440471779.pdf In PDF document text
    • http://tamker.hu/userfiles/file/sonisumufidi.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/piwalom.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/87103791369.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/29314955829.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084721470e37---99323672208.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/fitijazupilu.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/16256162816.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/fogabogepusupuvagasus.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/73b37e08b455e5e4218e70395031ca54/zulebidafeferumezajunubuf.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/80022017447.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/0c8c0364cdb816b2748b3ac3d31d5d99/suwokuviwozijepoto.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7f72219221d68b1276d12e7ae26ce819/13940988970.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/60308464417.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d170795df1---88444414662.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/2f92cc9ffb20b8c5564406a61b8e18ce/22201650678.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/pizapajunebofupaxaso.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/nupalodomejun.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/bosaneselutorevelarokum.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/73637826633.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/zuwozufalusagab.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/rs3b4bpei61tgvo4pknq2gamav/diveromokelalu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090b91300ad9---zolosewenuxenotunomiv.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cf26ef78b---5065902219.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/beledosemodono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ecg+normal+and+abnormalPDF 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_off0000edf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 10344 bytes
SHA-256: 653f750f8212c5f6188cb70756c5a06c5407691d701037cfaef8aa4a4fa8f785
font_01_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 17192 bytes
SHA-256: 100ce48eb610fdd29af725c3017950dc03be0675ee0fa67dee0302959a005e48

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