Malicious PDF — malware analysis report

Static analysis result for SHA-256 604e3d7cf23cac73…

MALICIOUS

PDF

79.0 KB Created: 2021-06-29 14:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee8ea1a22eaf140403f5bb25ac4a0a5a SHA-1: 4107b4ae764d114d5e47384f19dac117c5d7f5c9 SHA-256: 604e3d7cf23cac736de436caf18612340c4ae083017abcda20373040972311b6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7878

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=she+is+conceited PDF link annotation
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607daff737314---zesopezesanuvaxe.pdfIn PDF document text
    • https://artenika.pl/fck/file/gerimolidorosarolaneg.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/62940892732.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/bunogilebamelu.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d1df92dd1---lagavuzewunofebamaki.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/psuvik78qmkv14m2m9vbumn8hc/94166798601.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/dejagapubiluve.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/be845dde3ae4ed1187d359a4ed0ed579/61269607047.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7f8e3175---kovawebixojilunaza.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/36470255231f9270a1b445d500b030f6/18747729267.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/gugexobofutuzeza.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/lizexekidamigudi.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/3pt30ah4t22njtanjvvtdqiiut/57805448645.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210517140237.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/70551025050.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/a0nqsoh1frqs5npevqh4vfonq4/tuluga.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/xazolixegob.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/bifemenamukipagitidi.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/gi8l1gv20n9dg2fustl39otqh7/24570667084.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/k6tgo64o8p540cfa3mh2scuj03/nolejetarodagawedasuv.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/sitazomofara.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/14a4a965616dfad631900f558ded3834/3010000760.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a09d0b57---47071888488.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/49d52d05067157e2755e08e8b562cc2c/mesirakosoputenagex.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607310d0c6dcf---15691999438.pdfIn 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_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 2672 bytes
SHA-256: 6e4d6c037ddf2d36efdbde69efb8db9b6b5157dcfa0d436b2a49b4e65c537825
font_01_sfnt_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 10236 bytes
SHA-256: 58a6968be60bf9b2dea36ab4638e569d98b6d61139f6f5e140617c0ea961ccf1
font_02_sfnt_off000111b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 16632 bytes
SHA-256: 135606352b3a5897c0ec4b02e0a8f61eb75f5fd6410add59001cbd4b2af56e7b