Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c88ed2e54c82acd…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 21:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 48821c17a8b8c121ea94e85a0f590050 SHA-1: e8dfb67768d394644f697cef245f75da20ff253a SHA-256: 3c88ed2e54c82acd9028be3f8076adfa62ced96c5facc411023dbe65613692fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9974

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 http://ecogestval.com/userfiles/file/jerajazusosilexej.pdf In PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2876d9f98a---ramafisubinerepivaje.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/b70624bd4bcd27c2e45847ad60bc1518/84455614779.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ffb006349---50453692019.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/lugasototekatuwava.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/mejupatipolofidigof.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d421c42904---65983848933.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/pejepufe.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609625fc38cd4---xunotagobuk.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/fowupuxujogafepojojoj.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/pifapenibijumajuvuxom.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/94440525909.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/lifojutodosepijirex.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8d7bb8aed---65770967322.pdfIn PDF document text
    • https://nada70.org/userfiles/file/sugulivigi.pdfIn PDF document text
    • http://traviet36.com/upload/files/kiwarobivobasa.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/kijodigopalone.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b87bed5b91b---zotoxinepuvuvalokes.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/12107642550.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/b0lh1ms475s95qdelpa1bi45jf/92618672793.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/23648159814.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf85b64480---kojelimumefojal.pdfIn PDF document text
    • https://tsolisp.com/files/file/bibubos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918cba92845---23844812731.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216292242535894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=geneva+agreement+1954+pdfPDF link annotation
    • 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_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 10952 bytes
SHA-256: 44b5f4be4c7586b2b0055445f87b7e0888dfc50130f44ff4effe41bcea69ab10
font_01_sfnt_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 17972 bytes
SHA-256: fab32661939107502d955b6d248dff0dac3ce9e85733babddd6acefb65df47cb
font_02_sfnt_off00012b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1