Malicious PDF — malware analysis report

Static analysis result for SHA-256 953a56506d3f9e28…

MALICIOUS

PDF

86.1 KB Created: 2021-08-04 04:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 930c5a2707f4c91c60670c8af0884e7d SHA-1: 82967d43d0a8e1afd03a67d34027d3fb438614f8 SHA-256: 953a56506d3f9e28d645bd0b01ac173455609b21e4da47e50652f02d7ebc5788
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload directories. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple links to potentially compromised sites suggests an attempt to lure users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/fcac84cc3babd371936292b72c803532/ralagexex.pdf In PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/56759499635.pdfIn PDF document text
    • http://93564497.com/userfiles/19020521118.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/68830257994.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/kemogumurogobaloxuf.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c405cc528ca---32096497022.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/konedekika.pdfIn PDF document text
    • http://leton.pl/userfiles/file/lubunovasorukigizudib.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/vopigoza.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/73333029086.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/4fim9lb32mv1kqcborr6k5bh04/lefefanodowovereron.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/qqmf2238ssav601bosfav68ei3/lotefetadofu.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/39741590009.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6d0c0e1b9---gevenikiz.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/levizavoredi.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/xijedot.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/427c05f369b316d4bb504effc713b3db/50745358217.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5276396400---95520848186.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6eda8dbb820b635db5fb2a5c476c6c8f/97631931206.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/9e3c9750a598fc9d004fa525d2630e75/57933393414.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c7323f4ac15d936ea180b725328f1247/kezegapejajudobutisile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=f5+load+balancer+guide+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_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 16700 bytes
SHA-256: 971c6e96bd6fca3edef3b3c186c5a9eae2b09d841b2edcdcf9a53c0079182df7
font_01_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 10880 bytes
SHA-256: d2f10e266aac5b4d5efd5c36749bfe8b8e3a1fe9784d9d76b08f1c1edbd92ac6
font_02_sfnt_off000131ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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