Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4ba625680ca2bb…

MALICIOUS

PDF

94.4 KB Created: 2021-08-08 20:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 747b12db5575f8f4cbf8562bd127a9f5 SHA-1: f0b8f3425e758ec2cad81bb0e5dfa6da2c6abf62 SHA-256: bd4ba625680ca2bb97d295badcef2a420eded7f3f114d3bafc9e62028f768a66
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://alhouti.com/userfiles/file/10802079782.pdf In PDF document text
    • http://redigonda.it/userfiles/files/devurafaxunabi.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/36821178100.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/cnbtb9qrlb9vvgkra6giik49rf/nimazaxanugolen.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/13923255cf0f857bcef7c97cb0103668/jataxovagosejavujibevaket.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/53380139735.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/revasolopima.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/21016380733.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/4514207262.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e95feaefd---12921315512.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82789572242.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/6497463597.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/379e389b0ab328fedb4895c8fc4c66c9/fulixudazupizod.pdfIn PDF document text
    • https://longhoang.vn/upload/files/wewonexozis.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/924c242e38c78f1c5ce94bdc8672e27b/zitikipak.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/nepafukosevatoxasolif.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/afcd5d3491843cfda14804650e349c06/74040229344.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/5980584142.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2t9l4e8oefl8klq1gd6r4ccum/zirijumakanira.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/77698182649.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2cdf8b41c08d1efa1b302c6a13f27b27/sujuzanumemonurasomem.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a337e464cf5---satevupinigaguxet.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b1842d039287bcc52952e2e4f1ef2bd0/nowokikunuwugamozaputego.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/819da4d5aae393531f7cb6cb597c9bd3/54994169423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=is+hoi4+multiplayer+goodPDF 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_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 17300 bytes
SHA-256: ed46bf34001070c6651f33d0e027ac984bc9a78f390ddc2c8503e920afb15cd3
font_01_sfnt_off000137ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EA 10976 bytes
SHA-256: 5e204f50d4693992a71fd7813d2fb83252fc9c3d1e4ce60796129d6913af36af
font_02_sfnt_off00015149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1