Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7607eb0431460b2…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 03:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 481c7c2b009513d18693f648a6f4121e SHA-1: 6dc6987042cea7e76d703bb59c06aec3c53de863 SHA-256: a7607eb0431460b2fcec7d7767cd8b250d9dd455ddb420b88f9e3791953337bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and a link farm pointing to multiple external URLs, some hosted on compromised CMS uploads. The primary purpose appears to be redirecting users through a series of links, potentially to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pensiuneavalentina.ro/app/webroot/file/6703347894.pdf In PDF document text
    • https://clubslotalmatriche.com/calcas/file/91364353139.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/74814265454.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/lepepox.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/wawibekazeber.pdfIn PDF document text
    • http://tabletopad.com/images/file/lizedupakiminezadofodu.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/89472010291.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/baforifiwekezavigadujewu.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/15074441235.pdfIn PDF document text
    • http://chpcentre.com/files/file/gorigugekusabanodoruxubi.pdfIn PDF document text
    • http://lovesenergy.com/file/nakunawuxi.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/89959744016.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/pebumetuf.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/77732223729.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/37379507153.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/zatatu.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9ceea231bf597484392f2f12754a2374/bevanawisexitodawu.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/wikoxe.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/virosuxive.pdfIn PDF document text
    • https://efnnma.org/files/file/18592284094.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a73a35f4ea---14675678459.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sksp1mfmepsm9fc2m5idfatusu/1647684754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=watch+avengers+endgame+free+online+123PDF 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_off0000ddf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF3 19184 bytes
SHA-256: 0bb0fa594eeaaedf8a316284f2f55973b7ec87b98bb262b67ffd6c9d15af33a0
font_01_sfnt_off00010f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 11328 bytes
SHA-256: 33c1ef5c90379ab0af26b6aecd36c1c7366e989997262e85c6ebe8efce1a52fd

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