Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8567728ae75f53e…

MALICIOUS

PDF

85.0 KB Created: 2021-07-01 19:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9bf00bb796a889a673d9ff378fcabc5a SHA-1: 5dc0a299629a69cc93940f1f79f29fb1e036aea8 SHA-256: c8567728ae75f53e16f91b0de2bd63572f57151a75b35ee96e8098445fe766e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine results or lure users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious, supporting a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://cck-brno.cz/ckfinder/userfiles/files/geloponesi.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b421763f7---zofowozuzib.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02112f001---juxidejijukiv.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/vowegepavuzosuti.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210621_FB8083A4B7113956.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/jogufalijedewoweburinewu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ebe510f30---86531535710.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/buwozetabubefelefujufuvu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e35e72c32770d1af6e42776db8da0835/88558850073.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e2e876ffe---lapuwaxedazizazujunovi.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/povaxofevixedi.pdfIn PDF document text
    • http://canoeing.by/pics/files/19820275965.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/25115741942.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/53245328658.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160882788b807b---71683235234.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/0nc7uiiq0cu71gm9dcfe8rj7r5/romolomokub.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c62819aa069c3858c685dae7e47e5ec7/85486621.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/7m4hcgbivvl446chkqdg4mmccp/winepupiniwiwozaza.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/1a48d8000b1b001e4622bd0d699ec1d0/75282648097.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8b542f872f0c9e815e0c0d8cf3f82f24/94130246758.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160949bb911f74---visepifuvijejijoj.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/tabilup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+great+book+of+saint+cyprian+pdfPDF link annotation
    • 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_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 17676 bytes
SHA-256: 70576849a3c4a07b9acb16d157e673d8fb03e79bb97148ac0b907eba0eb894fd
font_01_sfnt_off000114e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFA 11164 bytes
SHA-256: c0bcd02f0a67404287284699ec52b7141a8312b674470c32c19e0fa22954ea66

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