Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dd004b705d013b…

MALICIOUS

PDF

97.7 KB Created: 2021-07-03 13:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff78f9d8c313d26861b1d2db7f4b217e SHA-1: ac6da270148ff341d37d5e01347f0dc5a7da29ed SHA-256: 81dd004b705d013ba777d833a473bb5f7002646b7936a9dc61283f6a900eb957
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. ClamAV detection and ML classification further confirm its malicious nature. The presence of external URIs and compromised upload links suggests an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd25c2bc885---vonid.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/ec6555d2bd0919b76bc5ae0b581d8a66/gedobariliv.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/al138hc8lbmqsbtvrb6jhmmc27/pegajameb.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d65a0d14f23cd1297a4a4cf34c72572a/84871924015.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b0506b07d97---xuligolowamojatipubabo.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160723851aafe8---lagukojejagagagarijidox.pdf
    • http://botosani.ro/img/uploads/file/japafezalixibedidux.pdf
    • http://airconbank.com/upload/fckeditor/file/safejakanijoru.pdf
    • http://bensonlandscape.com/editorData/file/risotuseserepipegu.pdf
    • http://baugeraeteverleih.de/benutzerdateien/busaxezobupurigaf.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f15ccb9a7---11499267384.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070d4f71b25b---89902849973.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6258a12d4---fexajozobewugokalarawib.pdf
    • http://pierrevillers.fr/mairie_files/file/95484433761.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/zoxuvokonebiwar.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da74b2c850c---fopomisomofabibosuxojekux.pdf
    • http://edwardlankin.com/clients/86087/File/bitodabibuwonatematoduz.pdf
    • https://theatresaucinema.fr/uploads/file/misejunegulofa.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d137eb3f8c885fa29678b61868b5cc01/rizaredufapegodobutiwot.pdf
    • http://mgocsm.in/userfiles/file/gugexebakasuliluzab.pdf
    • http://imaginove.eu/data/Files/21086654310.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/edd7oq0olap9tdp5bmjd08f70t/padufiv.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/496d47940b4619652ece7b8e824ebb74/geletefogozafijefeza.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5d4eaeac2---noxarosovuviduw.pdf
    • http://brandiassociati.it/userfiles/file/80933496432.pdf
    • http://mwflower.com/upimagesfile///zupevopiduvakajifeguvirav.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=lumber+tycoon+2+modded
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000fa15.bin
34802e89bcb3048e26558336ab0f828568513769f69d716087261867cd6a339f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFA15 10492 bytes
font_01_sfnt_off000111ff.bin
dc3f21f5986acd4d8e420e09556f94fe63a7d2294a67e0b05d0768f5df8cfc39
pdf-font-stream PDF embedded font (sfnt) at offset 0x111FF 16168 bytes
font_02_sfnt_off00012795.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 16792 bytes
font_03_sfnt_off00013fa7.bin
6a5c8949b98d181a5dfe90bc9b32d29289ca8d13bb8b3e94e12729f4b2e6cdb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA7 23428 bytes