Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eaac2e4e840f9e8…

MALICIOUS

PDF

62.6 KB Created: 2021-05-10 04:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca31e5586c05901c9ea7d40cd84f5d8b SHA-1: 5614ae1668b75b07683ea35dd0d68eb1f8ba5eba SHA-256: 7eaac2e4e840f9e80d3f6a79e21d2dbbdc811b4315a3c330d893c3d03c466b47
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malware or phishing content. The presence of multiple URLs hosted on various domains, often utilizing form-handling plugins for file uploads, reinforces the pattern of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

Heuristics 5

  • 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
  • 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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d7ef60f78---27252504063.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada8fbb17b---86856725205.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848a49ace6a---nusilumizolaxipixuvama.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607501dd7eb31---41926976147.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/g3udk0diclfnlh9js26q9gpjnh/liwofapoliwum.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/afecc96471a438a3c18060bb13ba8cf7/nofugifore.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b1855f7126fa360a27df731922d0d8ff/wudenigexez.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607258cc61f0b---padinisuzozosazasa.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/joxojug.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/fcgvgd2b4nfcplghct32bsi1gt/xabilevomuxajolubofu.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076261d89316---1089862366.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f8f9ebe63---38063685572.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/11551393192.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084211e1f096---tigej.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/59ff7ad19b97b71a7d5df7862e0e9b0d/72884207668.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=game+catchers+mod+apk
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d75f.bin
fab81f99cd02c79d902878d3aad510bd6ed66957743df9edbd2004ac6778eac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 5376 bytes

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