Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29491f757b89abf…

MALICIOUS

PDF

82.1 KB Created: 2021-08-20 10:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c171785625700bfafb058b712e122a2 SHA-1: eb57f58027828f2e33f48ea4d6645260e7ae93b1 SHA-256: a29491f757b89abf788fe8591a88e340cd3eacef71a60b34e488cd04e6ec24de
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing pages or malware downloads, disguised as popular media content. The presence of embedded URLs and the heuristic firing for PDF link farms strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=bahubali+2+full+movie+in+hindi+1080p+download+filmyzilla PDF link annotation
    • http://dabaizhongxue.com/upload_fck/file/2021-7-22/20210722155236862975.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/155465144.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/wezoxiwid.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/c514c5bb178395796ea83b39e860bd3d/67972215308.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/gezuvibiso.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077062a4ee9c---xedaxudiwelogozugam.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/5d2a6fc5505ea3d292d64f088672a1b1/23678300125.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/43468884825.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/gavawiveribar.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/24952954389.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62cae9d745---kazeletojiji.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/744d7a7f112106453d05bb6417bafadf/80116931467.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6237d51bf58f788834840149e75a0325/wesuzipibuxitoponezudeg.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/35109529224.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/20845305863.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/bizivasozovif.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/eb90100b2605e7c52b3d4ff904396326/67913488097.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/mosixisukef.pdfIn PDF document text
    • http://vaynhe.com/upload/files/nitipametu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c1b405125---joposaruzifef.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f65c3f29a---40124553753.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_off0000dcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 11520 bytes
SHA-256: 118b5f958f152b2f99145e7adc029c029658acf80622c3a12c36e823deafa974
font_02_sfnt_off00010fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC6 16508 bytes
SHA-256: 915ddfe6e922e11989c75edc45ee8fb7a1eeb2fc06aae944c5465733912bb2ac

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