Malicious PDF — malware analysis report

Static analysis result for SHA-256 4769381defe494a4…

MALICIOUS

PDF

80.9 KB Created: 2021-08-14 13:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db92c21e6104d5d8319ca699b8efe005 SHA-1: cc7d7c0a7f5ba67588825b0f41470b442fcfb869 SHA-256: 4769381defe494a4bf757688e32e7b36b95c23bbf35400b16d1bafd5a88877b9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://toskov-yordanov.com/userfiles/file/werunezewadajenuwum.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e750b65212bc91afd3780b71731aaebe/mefovukekun.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/qe8o695hu1n3kci3cnmd59o374/xidezitetosabepo.pdf
    • http://newgrids.com/userfiles/file/koledefewagofovozalazu.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983d8104b21---vofazawafutirutiweripanon.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dead70290---26597596675.pdf
    • http://familiegravesen.dk/ckfinder/userfiles/files/18399624345.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/tewuwipowewijakarisu.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5857a73f5---24324370166.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca6bfb0e65---38966920922.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/1r4dk2b0ngjc0brsr515uqp8ee/savidozuvewirupujonidofo.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7db666213---85953213596.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/bosupowofoted.pdf
    • https://tese.in/ckfinder/userfiles/files/2462612341.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/podixowisameresujadow.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/gutas.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/56714cd88d5563235f8bfdb22506bc8f/xijageraxu.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f0f880f56---minefanatilolozita.pdf
    • http://amphorabeautyclub.com/campannas/file/pedoxawopa.pdf
    • http://homelife-superstars.com/image/files/jonasiwunetarafelel.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/9f6f6ac1b6dc9ca6195f0c5d2b7f7c59/zerelegekupedo.pdf
    • http://chupanhnoithat.vn/upload/files/xefukajedejifilik.pdf
    • http://ttccid.com/userfiles/files/2218397253.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b1a93baa9518445eaa42c891aa3e737c/rokerisekugunat.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=direito+constitucional+esquematizado+pedro+lenza+2019+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1cf.bin
55f4de1a1b77780ca8c0e06e49a56f8b699e89253ffcbe604d039c6869dd77ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CF 18388 bytes
font_01_sfnt_off0000ff84.bin
20de52486b678ad411d7514c47bdd58e4b69992226f760083772b5379e32b2ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 11552 bytes
font_02_sfnt_off00011ad2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 16792 bytes