Malicious PDF — malware analysis report

Static analysis result for SHA-256 d545de1c14c4560f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 01:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3daed33627ecac48b22009d964e73b38 SHA-1: 07b3910c253dab3037ec63faa6a1d89731ca5af0 SHA-256: d545de1c14c4560fe3508a028250a73d81906ae0dfc3b6f6514765918a2c8506
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and other domains. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606de8c45de7b---nixukokivetenuja.pdf In PDF document text
    • http://deforma.it/userfiles/files/49036699517.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16115e42ea41f5---2452658972.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/fasezawagofuwakin.pdfIn PDF document text
    • http://bakoca.hu/files/file/46334593158.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hdhustl6hrroij464ok6uiva0v/88829735572.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/26246493763.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/22817921647.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/jotoravuninorovovigoruwik.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202108112321211480.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/0009c23c99e10265fa4d89d891a18b50/wufigigelusegur.pdfIn PDF document text
    • http://krzeptowski.pl/file/fatikonezi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2dbf29ff5---87179103413.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb4645ac8---deluraxexuja.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210829075754.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d5cda6f6e4a4f53d0ae9ab45d17f1a00/53359323867.pdfIn PDF document text
    • http://ridendo.cz/files/file/28277893589.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/vugelefuxe.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/1483152766.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/ruzoruwarowugul.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/g93dvutghc8rntkc5tehno6njp/41565959454.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/43f9b34ffd1a410fed82fe3e4d6ff0f1/loxuxamovepizumemu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b4232311e---jowapezugorezad.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a0c68b4e---66358709426.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/4b9a1fdd30291e6983e505b596f0e664/40848934380.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/bixurewakebawurubanutige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=telerik+test+studio+tutorial+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_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 10544 bytes
SHA-256: 238e9233a9945373839e083531f4b3c02a232466460f73087021d945598dea4a
font_01_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 18600 bytes
SHA-256: 4f900af748bfb8ee53e45432b654d39a10bc2248600cc4cd44905bf2e2f029be

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