Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd773f2b878281c8…

MALICIOUS

PDF

71.1 KB Created: 2021-09-24 15:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 36bd225ebae42d4fa77b43707ba905de SHA-1: 88a087a2a8a10076681670a6e2fd19326f68d58c SHA-256: cd773f2b878281c807646ac3868d1a923604a409c53a7fb5b38f3185a60207a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics strongly suggest it is used to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://krisoc.ru/uplcv?utm_term=how+to+download+gta+vice+city+for+android PDF link annotation
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400ff904934---wasoz.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/80183545516.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/jabokipaxepibaseguner.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091710575911.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/bebabaxofol.pdfIn PDF document text
    • https://ka-base.no/images_content/file/84905163354.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/supofosodaliv.pdfIn PDF document text
    • http://bushurov.ru/images/files/37494547964.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/74076831598.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/rifitosefubegiwonorafiba.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/muxovibevu.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/pejoxolugevixi.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/zufet.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/kilibip.pdfIn PDF document text
    • http://esistore.com/userfiles/file/xememolevaw.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb4d39b59---56426267738.pdfIn PDF document text
    • http://effektfilm.de/files/file/98457890831.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/15149464710.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/nipuxotokasukowobesovof.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/57969311842.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/11053761298.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/lobekudalamumukikupova.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16149cdc46b46b---fixizekaroja.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/ronimobabebuterizedu.pdfIn PDF document text
    • http://spiregene.com/image/files/20210907_153731.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f926495a56---jutuwozu.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_off0000b6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D5 10740 bytes
SHA-256: ba1d328adaccc3a8bbb7353e3f712d6e492ef019641d674fae0257b2e618db7b
font_01_sfnt_off0000cf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 15428 bytes
SHA-256: 56c08ff029fe57cd0743ba8af5f3a0ada3e56beaa5f6a42ac4abd5fe2aa2b303
font_02_sfnt_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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