Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ebfebec2e07b70…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 00:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c40cf4b48335329208f4295d941924fa SHA-1: d7154c105a6846e7431be341c860b0a9fbf75663 SHA-256: 40ebfebec2e07b7094f55805c98ba17679c2864c54ae9dc395c20860d3c84b32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm and a phishing/malicious document. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://drafthe.ru/uplcv?utm_term=where+is+rotate+screen+on+android
    • http://khyljg.com/uploadfiles/files/wedib.pdf
    • http://shinhwajudan.com/userData/board/file/13828271658.pdf
    • https://santevita-bg.com/ckfinder/userfiles/files/juxefesokabelatipu.pdf
    • http://godsownproperties.com/userfiles/file/dakuveji.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/53973235740.pdf
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/69221353907.pdf
    • https://conviviodihera.it/dati/upload/file/jilokupivavesog.pdf
    • http://sziszolg.hu/editor_up/tibiwej.pdf
    • http://abbwingslynnhaven.com/uploads/files/88740865458.pdf
    • https://ph2020.org/ckfinder/userfiles/files/siwexolarokotelusa.pdf
    • http://yao-cheng.com/uploadfiles/20210905155241.pdf
    • https://clubslotalmatriche.com/calcas/file/xurelafurasuzumofifex.pdf
    • https://asthasupermarket.com/userfiles/file/lajanebedokudido.pdf
    • http://clinical-pain.com/pds/userfiles/files/82582190799.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366808d2b22---romudipevijigakuzisazat.pdf
    • https://inprovitecuador.com/ckfinder/userfiles/files/birojidez.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135db65e8daf---lonizosiwilolulafetibu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/13adcc554302307098fb3cdde3c8c1e4/wugukesodosubizunidugu.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323fdbaee34---9827685842.pdf
    • http://fsoa.cn/userfiles/file/rivizofejatotusiwan.pdf
    • http://newbusan.net/FileData/ckfinder/files/20210917_0B5B79ECF7DCC970.pdf
    • http://aarogyamedico.com/userfiles/file/58563589419.pdf
    • https://bevillelecomte.com/ckfinder/userfiles/files/38699381282.pdf
    • http://aqua4you.hu/userfiles/file/roliduverixakim.pdf
    • https://genegurumiraclehealer.com/userfiles/file/lakasozesezonebinizadi.pdf
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/74375097115.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_off0000b577.bin
d1a0289c5a00cd9ff8a4076c5cf576c39ca014fcae2471e00004db6036393d9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB577 10416 bytes
font_01_sfnt_off0000cd16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 16792 bytes
font_02_sfnt_off0000e528.bin
6b242db88872b94ef7d034f12af0ce300e4c2329ff140bcfb9dfe9298369d75a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 14868 bytes