Malicious PDF — malware analysis report

Static analysis result for SHA-256 6caab9125852b41c…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 15:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88d392f111ab11c22d1de52c6c7a2891 SHA-1: 82c14b405dc16531264eb44ed03c618f959d35f3 SHA-256: 6caab9125852b41c26b171eab4d23f3c4c69c6e7b38e8d1b224a956f832a810c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=download+surah+yasin+latin+pdf PDF link annotation
    • https://eyetracking.pl/userfiles/file/nerosimasidikudixino.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/32176185654.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/31478818575.pdfIn PDF document text
    • https://daismene.it/file/telodakoberowaju.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/dedafavamubolabije.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/giwimakowelaketoroxova.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8bbe92fdd2---patezimeve.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/46775123699.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jejaxen.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/85763360593.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/2115173046.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/zakinoxupisezabawovof.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be634ca6c7f---fipejukiminogosipima.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/lph472cd5l5qphnnf3vo1d6kil/83101520841.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/leborivuvoxaremuvoxarap.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66d4cbeeb4---7636573783.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/55025314220.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cdfaa8e79---51205365390.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/72871249068.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/55s6k9m397koh6md0es286dt0v/ginijubu.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/11970427454.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d77d5e01fe9---mavululi.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/2693529307.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210528/file/61761502664.pdfIn PDF document text
    • 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_off0000ca86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA86 18428 bytes
SHA-256: 044dda3aff1f0004eeaeca696b353aa8f772553691ff7e3978f666649373fd32
font_01_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 10764 bytes
SHA-256: c84661622c2f1b55746841533d871b74e9595010febd819f73260cf833fe1052