Malicious PDF — malware analysis report

Static analysis result for SHA-256 971666e1cb8a15bb…

MALICIOUS

PDF

128.7 KB Created: 2021-09-06 18:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ef74193f80cd814316b75809cda37ea SHA-1: ae35074adaad9b8d9b8deb71fd1a641a7c5fe3eb SHA-256: 971666e1cb8a15bb3846e7a59f971140d0c97b0d80849339ef69a8335056258f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards an attempt to redirect users to potentially harmful content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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=aquasport+215+explorer+owners+manual PDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2af77949d8---39684071145.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607814316344f---11206517040.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609600a1a7a4c---ziputijasilebuxo.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/38828040789.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/84632988726.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/pisuvagumi.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/modotusogaj.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/gatezigeruve.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ea232c3c7---definunasobo.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8728fdad8a---pilapevuwubeluziseg.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/57091836558.pdfIn PDF document text
    • https://ebooksweb.net/files/file/kidaxotusuga.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/28499078904.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/06b8f8d5dcc257d2ca3c61ccbf33d6a2/63426588146.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/96362204468.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/70094773791.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/gesun.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/44274617737.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/77088639154.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/65891727641.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f7c0d2e37---23025832954.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/dff65aab6293c5fc2f57d4fb7ba34f29/72867362019.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/sojajex.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_off00018a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A240 21784 bytes
SHA-256: 5ff72d28bfeb6a1d259a54abefbe1be2ae428c47421b5ce47627dc601efebef5
font_02_sfnt_off0001db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB33 11044 bytes
SHA-256: 4d6ed8d3f88df2d10fe73ebffbaa8e256a11261da67f24bacf0965aff62af996

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