Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4ca70e76006cbf…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 13:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bbbc4a2aece811c18bd2cfb9cf6d2a76 SHA-1: 8a7efcad4748b4fa1bf6dfc2d50d53a88a8ab978 SHA-256: 1b4ca70e76006cbf2ceebf7ba8df46c28bce08083848e15d9dc6328eb2677d2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs, including one pointing to a compromised WordPress upload, suggest a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://catamma.ru/uplcv?utm_term=android+transfer+mac+not+working PDF link annotation
    • http://sethhukumchandschool.com/userfiles/file/nosenusofet.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/71802077776.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4592041443.pdfIn PDF document text
    • https://mauspro.net/upload/files/20426618329.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/65538541021.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3c6f28bd---89889868890.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/72ed3a32c4163ce6538611db93360c4d/dikoguzaginivudo.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/zevejurinu.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109181532406544.pdfIn PDF document text
    • https://flyags.com/editorResources/file///16541531878.pdfIn PDF document text
    • https://tuinvandecruys.be/file/10519448492.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135de0406593---xuzewibuseboxidalexuram.pdfIn PDF document text
    • http://saglamahsapkutu.com/img/editor/image/file/94129886004.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/59224968501.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/dinorinugi.pdfIn PDF document text
    • http://gabortech.com/admin/file/97607916637.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/pitoza.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/44774825960.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/14515943662.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/vureta.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/29778163460.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/mobigobowebawolefogira.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/30665929034.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/71014086352.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/niroka.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/merodununavaliruladazogin.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6f1f47590b611ef64c98bff18782f252/26715305136.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_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 18688 bytes
SHA-256: 76c1db095d215f9239d2b1b01460b8887e9798eabbb20ebf5741f051d17e3929
font_02_sfnt_off0001281a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281A 10932 bytes
SHA-256: c756bff941c92bede901cd71223b794ebd46e6be42225696c5b1379a9b288efe

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