Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ada50fca935a8e3…

MALICIOUS

PDF

62.4 KB Created: 2021-09-26 00:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 278e70d59428b5616236b38cd8bb59f1 SHA-1: 55c4962eaf6b77635e43ee491bfd3fc92f521693 SHA-256: 3ada50fca935a8e338657c19b88300735d44e83adf64a2ed422e3f6b711b3a53
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations or disposable domains. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to obfuscate the true malicious intent and potentially track user interactions.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2574

Heuristics 5

  • 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
  • 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 PDF link annotation
    • http://khyljg.com/uploadfiles/files/wedib.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/13828271658.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/juxefesokabelatipu.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/dakuveji.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/53973235740.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/69221353907.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/jilokupivavesog.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/tibiwej.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/88740865458.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/siwexolarokotelusa.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210905155241.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/xurelafurasuzumofifex.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lajanebedokudido.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/82582190799.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366808d2b22---romudipevijigakuzisazat.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/birojidez.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135db65e8daf---lonizosiwilolulafetibu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/13adcc554302307098fb3cdde3c8c1e4/wugukesodosubizunidugu.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323fdbaee34---9827685842.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/rivizofejatotusiwan.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210917_0B5B79ECF7DCC970.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/58563589419.pdfIn PDF document text
    • https://bevillelecomte.com/ckfinder/userfiles/files/38699381282.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/roliduverixakim.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/lakasozesezonebinizadi.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/74375097115.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB577 10416 bytes
SHA-256: d1a0289c5a00cd9ff8a4076c5cf576c39ca014fcae2471e00004db6036393d9a
font_01_sfnt_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1