Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e5a461e8e9143c…

MALICIOUS

PDF

69.2 KB Created: 2021-09-13 21:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad4195b5830ba107ad1495f7fb238d94 SHA-1: 98e53ae198358ce063660d6c311e39fe8d86d421 SHA-256: b5e5a461e8e9143cf50e6006a848178ae6964840524ed99f6eab9939ce37bb4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The link farm points to multiple PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The embedded JavaScript likely facilitates the malicious activity, possibly by redirecting the user or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://park-seversk.ru/other/js/ckfinder/userfiles/files/8182101657.pdf In PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/91732792117.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/58563148201.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/55564744054.pdfIn PDF document text
    • https://digicpictures.com/downloads/tofudewulafarivi.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613632bf41dbe---6277831710.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb5665844---3991240379.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/xematatasuraresonutom.pdfIn PDF document text
    • https://rm-parketi.si/uploads/kejebeluv.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/fokeluwalosetivekomipa.pdfIn PDF document text
    • https://dafelia.com/files/82583344474.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/94384406778.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/55204485856.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/2276008891.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/fudilemimolabafuxas.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/62634718779.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/51640217861.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/52852062657.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/bulikiwafelizijitagaxu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4929f77d---wevetapigi.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161376f1f404bc---xewoxulokeforadu.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/bivabakovurorogovikagu.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/12209272278.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/suvoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pes+19+offlinePDF 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_off0000b0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CD 15708 bytes
SHA-256: 7b69eaea259c8a8cbd54afb7988cc7ad41c51cc4a19e3e3106439b6526afae35
font_01_sfnt_off0000d8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 10068 bytes
SHA-256: 7e8b3e62ab7e2eb6206ae6cc8fd851645c764de00fc2292a4cb4007b96639e9f
font_02_sfnt_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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