Malicious PDF — malware analysis report

Static analysis result for SHA-256 978a5087a6477ce0…

MALICIOUS

PDF

78.1 KB Created: 2021-07-02 07:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d53d86379a1104676c010e2b5daf7d4a SHA-1: f6744851cee1a8e582fa10fd959c7d83aef8799a SHA-256: 978a5087a6477ce0276fd127c8f7e3b218a0d0337e7aefaaf929723692a4c984
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to host and distribute malicious files. The presence of a visual download button further supports the lure of downloading a payload. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest it's likely a downloader or part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://greenbrier101.com/userimages/bebojawixawelopelepuf.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a58760fc75---jafexafotoduxa.pdf
    • https://indobaliart.com/sitefiles/file/vasodufosufalejutogedofip.pdf
    • http://moje-stranky.eu/userfiles/file/zofuropodutesejak.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dc2a5d196---nivusipodirij.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/942dl9rpb2a2rkkd69dt0j93gh/wexesigazore.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-4/20210504042230140797.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827d6aa1d3d---75529828282.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb51c9aea7---50303612257.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd7f043b80---94548574766.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3d06b8c607b785b4006f8f3318cfb239/3397992679.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608283f827cae---38193498769.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1490d5edf56b39c8932dcbccc3335042/93640059913.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c969cdc4b---85888694635.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/88b943a87131de39bab1a504f8bfb1eb/bubujawuxuveteduwolo.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c10e01a15c612215fb41949f573cccec/jugifofepibimugijonunibuz.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/94b5df6357f2bcf3c9682bc4da5706b5/40649813099.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6d53295a---lavidof.pdf
    • http://kinocosmik.ru/sadm_files/46940773817.pdf
    • https://bdaudit.ro/userfiles/file/gidizaxadoratururefam.pdf
    • https://armandofalconi.net/userfiles/file/jimolepebuvisizali.pdf
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/2133679036.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=superimpose+picture+on+picture
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d094.bin
40386662d10f0d23717ab7fddcd601238d445299dddeda4cce080db4c9584617		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD094 10504 bytes
font_01_sfnt_off0000e870.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 16792 bytes
font_02_sfnt_off00010082.bin
a2ff3f6ad227bf7a8d1059d28d14e9aaad4a632e288910ecf959ca2708e9632e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 16400 bytes

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