Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d08945b17a30f7a…

MALICIOUS

PDF

88.8 KB Created: 2021-09-19 03:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eed9b11d9f1397f754f61f94b805c397 SHA-1: c3dcb677e42db7bce5f3aeb6ea7ef009cc3eab3f SHA-256: 1d08945b17a30f7ab1b64d9f14772a91e6daad35e95fa5fe5bd54451195fdb10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external URIs and link farm heuristics, indicating its purpose is to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=asphalt+8+car+game PDF link annotation
    • http://villacappuccina.com/userfiles/files/63747179981.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/27255038782.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/deneraxujisudegis.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/kipezafixebama.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/90740704974.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/94644971452.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/76589253702.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/2j59tbdn72supbm5sm0tfo75m6/64677123613.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/65249164255.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/zewedinopunoli.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/mobekefarex.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/83665737310.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/gonifa.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/24786971706.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/pi2snnrhul7potnbbk3q2m5jh1/36749297083.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/viperibezojuzemesis.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c228c58ab4---4124904470.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/zaziposawotutuz.pdfIn PDF document text
    • http://etre-belle.su/images/file/xuvijalazisotu.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/sd25nsgaossuh21i1v6q71oc63/49362893134.pdfIn PDF document text
    • http://vodnik48.ru/content/file/78595705556.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/xefuwogarixepoxabo.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/nuserotoxopimivaxomumazek.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_off0000f5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 18124 bytes
SHA-256: 588cb4be9d427f71839b6023a6f91d4b2e008290bd3dee769f2ee12cbbdf031d
font_01_sfnt_off00012514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12514 10692 bytes
SHA-256: 22231f7fd87d94c30d6696300ad89dfb1e996297ec65b9e4a81afd084f0ef562
font_02_sfnt_off00013dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1