Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5a15e582e5f23d…

MALICIOUS

PDF

68.1 KB Created: 2021-09-15 16:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c73bc3f68385b218c0315edb4e6a67f SHA-1: cfaacfb660dc7fb0fd8d35e8df5bd97f8121b6a2 SHA-256: 3b5a15e582e5f23da32f4471f10af4972d71645a993e009019238ba58638703c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded links pointing to various domains, some of which appear to be compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links likely lead to further malicious content or phishing pages, serving as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://irlanc.ru/uplcv?utm_term=morepurplemorebetter%27s+d%26d+5th+edition+character+record+sheet PDF link annotation
    • http://technimexvn.com/images/ckeditor/files/72644036996.pdfIn PDF document text
    • http://104408017.linker.tw/files/9849511102.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/80750494917.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136eb068c59a---todamosavivisirukena.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/divurikazuzasidezunigibeb.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/17595736658.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/89449490210.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16140d58fc80a4---23123317811.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210907080002.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ab70d98e9269165332800fbaa9f47179/20868835916.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/97641969860.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/zagatiw.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/21496916436.pdfIn PDF document text
    • http://esejsc.com/upload/files/dawuzinapizes.pdfIn PDF document text
    • http://geasit.it/userfiles/files/51502147876.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/45321810623.pdfIn PDF document text
    • http://apex-architect.ru/images/file/77006861243.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/pemitavivodufitowunat.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090422295021.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/jafibukotuzizegigaxulemo.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/19443126322.pdfIn PDF document text
    • http://klhl.com/userfiles/file/kokewodanura.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210911060135.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/nemotufeputakemowuw.pdfIn PDF document text
    • 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_off0000afa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA8 14248 bytes
SHA-256: 4f5f41af6e44fdfce44bbb8db83dfd161782994a635083c9b122a365a47d07c3
font_01_sfnt_off0000d322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 10460 bytes
SHA-256: 2a68ea85badbd735b3ddb72d4680947a24602c940fef50a6259fc9fff5fde5f3
font_02_sfnt_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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