Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3ad209f84b2bc8…

MALICIOUS

PDF

139.2 KB Created: 2021-09-02 08:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ec64f501b67f8d2dbe529095a273e48 SHA-1: dc4c9eb5ce25db7380901242b2b5afa8a88bd321 SHA-256: ee3ad209f84b2bc8ac7f7d4ad688794f9d7f3ea0b5798ff1eecb38f8429af586
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to manipulate search engine rankings or distribute further malicious content. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/9jvhiaj8f3i74ftsfbnlh9rjjd/rowowe.pdf In PDF document text
    • http://tsuiteru66.com/userfiles/file/83659531861.pdfIn PDF document text
    • https://faprosid.com/file/3100736178.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6dbc7c6ab---jexexonedozeziwimof.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/rumefu.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e983bb5d0a52e1aebbb0edc30f170bca/84630727574.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/78534002463.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/vitebawekozojul.pdfIn PDF document text
    • http://envigest.cz/upload/file/dewipotexajino.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/fomisiwasewas.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/wolisaxep.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/80240225672.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/siraginasoxo.pdfIn PDF document text
    • https://slide-bearing.com/d/files/74001108628.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/8105215490.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/goxula.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/kmvi3ipan06agp4ncma7dtta5f/zilagediwa.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/nigigebaxusinexilaze.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/zejobatozanug.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/0184381821b6ac38797b7a6dcd51e3d5/pejinerij.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1de02cb35---19335802090.pdfIn PDF document text
    • http://hzqzg.com/d/files/4701257927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sims+4+cheats+needs+xbox+onePDF 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_off0001b804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B804 20620 bytes
SHA-256: 6209c7bf3b420516ad3731173dfbef5114d9f0e879794eb579919e487c9d3174
font_01_sfnt_off0001ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2055D 10884 bytes
SHA-256: db0b26c17d401fc1b6d2d3f1428f68ba323209da3aa586d8177a8f767b54a0f8