Malicious PDF — malware analysis report

Static analysis result for SHA-256 2333a13a7637db8a…

MALICIOUS

PDF

92.5 KB Created: 2021-06-15 12:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b3db01b07ba327b387e9bb832d0cf75f SHA-1: 83040295154d8ae1af91ce21a2b3c46f0a4e064a SHA-256: 2333a13a7637db8a20dbe6d3680c8e686b13ab455c70405cf3d9702cd26fceef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • 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://laborke.ru/uplcv?utm_term=online+mangal+to+kruti+converter PDF link annotation
    • https://mtmnetwork.net/uploadEditor/files/95423531574.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff49bc72d3---82050519466.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/lalebe.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/9110711052.pdfIn PDF document text
    • http://mldinsaat.com/image/files/94255892956.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cb8eb2947---69443826389.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/e7cdbc35d44ec27f27437f07fdd582c3/jodowinijaxibi.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/37974654109.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc8fc9331---46051598156.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac6c69970---bixomibuxobuwaworikile.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160872098495c6---98463186496.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/51502860220.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/kepifapawokibufevi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 5092 bytes
SHA-256: 746747890446e583376f8be86bcf1f30c8635def051a7a50a74b51ee319deb96
font_01_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 10996 bytes
SHA-256: 0d18d0505a52ed54a1ecb40a98d80c91c5e6ef07d657ce001d22a82852dd851c
font_02_sfnt_off000125ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125ED 17840 bytes
SHA-256: 1b05116cb97e5974013765ad6876d6075b1cd662db3854208d42ba3eeb92a70b
font_03_sfnt_off0001411f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411F 11420 bytes
SHA-256: c6adc282dcbb26f43bb57c141e573ddc5d9374addb4245fc3d00155a193f25d0