Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a94309717fe9d2…

MALICIOUS

PDF

83.8 KB Created: 2021-08-20 10:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b1bed58116339e0bdd83ce88e9836c9 SHA-1: db061eac1f095115a5c6de938c63530bdd021603 SHA-256: d4a94309717fe9d2685c6efae8aed49a915feefbf276662aed0df0abcdadf25a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to redirect users to phishing sites or download further malware. The presence of multiple external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://myphi.biz/nbloom/fckuploads/file/nubumaxorujepimiximeri.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c608dea8b---kokuzewujet.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/1hnc8k48b3hameonbonf8oaifm/loxelaxi.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084390876177---sizewigutuzexatuverokoxe.pdfIn PDF document text
    • http://108homed.com/userfiles/files/24199498878.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee95fad3dd---20507872196.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/56585468547.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/c25b09c055ab49a1ea9299d2e13f8eb2/13255576899.pdfIn PDF document text
    • http://bienbao.net/uploads/files/bemafafedenokupajiz.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0457f8252e---bobudadabego.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/titebubagid.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaaf643afe---65923064125.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/22254959400.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/18666138975.pdfIn PDF document text
    • https://triosms.com/userfiles/file/puwefimuv.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/90015656621.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/32830382379.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/5019d58112063f88a5c4d6203528cd5e/zevife.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/23259981441.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3f73a619461a6b6fe0e88c8b5e511e75/lupojinurajedoxewa.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9cb56d8b---wezinetatimuzokanato.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/tojojofufot.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/rosiriz.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609074b18cca4---voliw.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d147b945---97940790693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=roblox+username+generator+not+takenPDF 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_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 17304 bytes
SHA-256: e4d14b03383b94a428805b443fb47e853566affc480664404a2de6c6ec93af74
font_01_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 10836 bytes
SHA-256: 40787e06443b49b0b773674e3b89c4e373a5021eba7813ffcd8d853d6a2b6353
font_02_sfnt_off0001295e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1