Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e37768de5b0b4c…

MALICIOUS

PDF

87.9 KB Created: 2021-06-26 04:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5348d562339121072533f524749a6121 SHA-1: cbbe774deed80475ad760391df05687008dac8d5 SHA-256: 36e37768de5b0b4cf8229a92121bd7f625166c28a1c84f4ad2dfd04521ac6178
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves a harmful purpose. The document functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads. This suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.findvoters.com/userfiles/file/79795285113.pdf
    • http://writtenmail.com/upload_images/file/34747651204.pdf
    • http://bidmitt.com/img/files/file/kerarawexixemejo.pdf
    • https://marblobaths.com/app/webroot/img/files/37295767883.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdabaa8b4bf---52026773356.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/6d5fb8dc8309e822ad348a6c34164f1a/81769984445.pdf
    • http://hashtag.school/userfiles/file/labovomepugusutepu.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098fa697aef1---42787911321.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b37d82e84---30090979486.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/01911835b91923f835d73ca9a8f61bb9/vepiv.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ef6d56651---84591413427.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607443de59517---7479236185.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/44962786665.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/cuu9847ri4h0s7aqs1d5l02lt4/pezitixogur.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080d81398508---30836443523.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/nrm8m7gbvu2vpec0heiie9tfk7/17380825655.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/segelumumidudopofonatini.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081e50e6950e---lizuwolaporal.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3868ea74f9---laxevifurugepejotera.pdf
    • https://calendarsunrooms.com/userfiles/files/kebalutoziriwinulejetizi.pdf
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/rudedap.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec9fc91b3e---992831977.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea1409f28b---43273429129.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/woximod.pdf
    • http://interel-rus.ru/test/sites/default/files/file/muzuzabixadabijez.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=project+management+textbook+pdf+download
    • 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_off0000f0bc.bin
18250d3fc8188179d00c0faa060a6a25c84e78786087a0d9c17453c9cd68b140		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 11252 bytes
font_01_sfnt_off00010ad4.bin
8aab6ee3cba22b65cd6f15d64183b627d532884afdc15dbb18c8c1554d28a6d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 17368 bytes
font_02_sfnt_off00013838.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13838 16792 bytes

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