Malicious PDF — malware analysis report

Static analysis result for SHA-256 02acb1e9a70fb266…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 09:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21a4eb7c8ed18948d5118016e25ead33 SHA-1: 7fa93b638180246695e7f76ed1318fae0f9cd47a SHA-256: 02acb1e9a70fb26637a70f84bee09a8295f6337b4ff5da90237ba9f8279ec60f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=date+a+live+season+1+episode+1 PDF link annotation
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/57537524527.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/lplihe7rre7u90pl9uhsdsenu6/jafefexuxofataxenem.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/58019706092.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd78d90bc---77910947793.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/retajerimoliwiru.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/sukanagoxipo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c63ab3265f---70238476441.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/xogugejenejimirup.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/wakerowok.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/kigixevovidimiri.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/vavexatozevovemom.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/zagosabidedisi.pdfIn PDF document text
    • https://partnermind.cz/images/files/28263529925.pdfIn PDF document text
    • http://tabletopad.com/images/file/dazelapizidu.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/fizasog.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/mogigebigupokuxumijumijit.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/81743543400.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/83959996331.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/farogosiwikekerevuwev.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/87402491201.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/11767217879.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/35165599326.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_off0000ae94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A6 16184 bytes
SHA-256: 848d1a203515c183e768716655af9d97997db61db33264cf52b861a5c750fdeb
font_02_sfnt_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 10404 bytes
SHA-256: 3a7a566d9984b050e2ee921c13ccaba1b6c1f23f7ca61055df28d5487b5b2a2a