Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d103f12cfd71857…

MALICIOUS

PDF

78.7 KB Created: 2021-08-17 06:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: aa6037bc9305c2be8fe290c7e6172763 SHA-1: 078b24d670ac649b12bf9a61a85c59a90f990db6 SHA-256: 2d103f12cfd7185736c7c3e77298a20e6b2eedb1dc8f798efdba2ac917fe5913
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 0.9917

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://irlanc.ru/uplcv?utm_term=o+processo+psicodiagn%C3%B3stico+e+as+t%C3%A9cnicas+projetivas+pdf PDF link annotation
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07dc80222---42282233526.pdfIn PDF document text
    • http://polletnv.be/uploads/files/45619118153.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/21150873811.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/guwobawewikixe.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/944aec7066b29a601348edf98196a180/90484468423.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/35636936689.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f03797cb2b---96976343242.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd5ba55225---3411551852.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/7466958619.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/zotojopagitanilosixadilu.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc06a526546---bupemed.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/fedarod.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6dd8bb5b4---liwanakodeteninumoju.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/xivafopofuz.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/69507486ccefcbe83e8d64e5de449565/93902411986.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4660a4876e75e41a9e123031398cb516/46428705536.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/354428621.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766df0446ee---xumoxoxunikuwositivejus.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/xodabomidivemupiros.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86940d2947---piwezubates.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084b52be1497---8626457755.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/nefadumupo.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfb2713675---vezuwanotefapimabumoma.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/bamov.pdfIn PDF document text
    • http://iworking.vn/uploads/files/8675392175.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/purinob.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_off0000ce70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE70 11264 bytes
SHA-256: 737636b09c6caf6cfb8e21b057c525f5413e9134687c497375841fb3a232f552
font_01_sfnt_off0000e836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 17764 bytes
SHA-256: 334401e471858a8e33b31881085df599c0786b871def2ba903069471dbf2c284
font_02_sfnt_off00011331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1