Malicious PDF — malware analysis report

Static analysis result for SHA-256 804081a9926363b3…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 09:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23fb079ea53a89add0c6ea83a6e48503 SHA-1: 0c8fc19e728c10823aa75f6ae89de818b330a24f SHA-256: 804081a9926363b357e1213205f8071576c3a7e9c969033283eb571b42fcae3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to potentially compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous URLs and the heuristic findings strongly indicate a phishing or malware distribution attempt.

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 https://kultmotor.hu/images/files/58588663818.pdf In PDF document text
    • https://majorsagilekvaros.hu/uploads/file/gateli.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/pugefigosobigebezuv.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/12540334345.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/nifizebimesodawi.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8e0dea19---34449835751.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339a598c787---62634443197.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/29e69a232414742a3c94a8d170b67daa/3884016853.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/72910540635.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/fopiberivinolono.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/29517992249.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/rozil.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae10a4bb89---84442011376.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/49143973144.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/27434264479.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/rixadomesixafugumusepada.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/67791325821.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5d9f01d774879dca1d6a798a52342d01/90662692393.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210908185558.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/zezorolezukigikikubotow.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a48d8d24cf---73760918368.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210903041304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+set+two+country+time+in+android+phonePDF 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_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 17832 bytes
SHA-256: 518acb6b2a08e7e798366e062950786ef6043c39dc7c9b5ef7a28bdb2aefb049
font_02_sfnt_off00012bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFC 11024 bytes
SHA-256: 87395c70c916725d619f928f9e716642ee9ba20d67afa7d70982eb064a4541f0

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