Malicious PDF — malware analysis report

Static analysis result for SHA-256 0176aa1d64f3edd2…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 12:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 39069f1cb628ba4acd3b59aab708cd7c SHA-1: cbe1b4e60890831df973942d43ee44d0a153d99d SHA-256: 0176aa1d64f3edd23f226a72b5a8af912f14fbe578d9a4daf1fdb51db0f1add0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to distribute further payloads. The URL 'https://ketchas.ru/uplcv?utm_term=ppsspp+spider+man+3+download' is particularly suspicious, using a popular search term to lure victims. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=ppsspp+spider+man+3+download PDF link annotation
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d6cc05064---23283633306.pdfIn PDF document text
    • http://iphysiology.ru/upload/46183203996.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/vabazorunerubudugig.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/telovukebemaxuli.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/bapetofodudowini.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/32552731396.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109232337254397.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/18024860163.pdfIn PDF document text
    • http://unityproductions.com/upload/files/somuziresuwedugukugusefu.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/duzarinifoporebaledefewe.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9f7c7b84679af81e0d1a8fb9bb1f83ae/93939835910.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a88a25cd67---51011919439.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143c28cd8e97---518552394.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/6hsuqgp80fm08vs932k4i1vbf6/15468289209.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/77126592831.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210916054509.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4jcl3untof43ltngk491vuhcmq/borububow.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/7178242379.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/nodenalukoxobugo.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/22169375773.pdfIn PDF document text
    • http://mousike.it/img_ins/files/20717974705.pdfIn PDF document text
    • https://people11people.gr/uploads/File/satiwudixilolutuviti.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/50547939.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/jatebisivumagefabegon.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210906/16309394553776.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_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 16376 bytes
SHA-256: fb1dfea90d2dde523d9a063caf80867b9f49441b5943ecd852681df3e32a9ece
font_01_sfnt_off0000dc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF422 10716 bytes
SHA-256: 230c714538d0f0a5b5d767085493917b9ea4ec38dddc247c7564b3eb3c837317

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