Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69301bd36cb37c7…

MALICIOUS

PDF

97.2 KB Created: 2021-09-17 19:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04edf6ead6d2eb2ecd14b9301d368bf3 SHA-1: 5c81772c1be33406b8b85297b77a69b9cce0280f SHA-256: f69301bd36cb37c7339f7b44b3a8385fc73e904410c40630c558cda0908ab8f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://orderkai.com/uploads/files/91495827977.pdf In PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/24ff58946574450c4c01281bd6aa6c17/bevekuvuziwiromulosupabej.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/86018341132.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/43113998438.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f96f0c7d0---9126515713.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6a9398c9---fejanixekalokalex.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/wupojikomutujapolirup.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/votagoropurotiteriz.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c85d192a242a5bbd2b66c35c7cbb3fe4/bowiwixoladamumog.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/99978282213.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/verisu.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/wejamupap.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/tabetura.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/lexoromije.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/mulofexinotolezas.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/35242907178.pdfIn PDF document text
    • https://digireg.li/upload/66624028299.pdfIn PDF document text
    • http://thegioivaigiasi.com/Images_upload/files/59714505288.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/3788821973.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/54885187143.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/risibakadakiboderedejited.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/wisaluse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=game+web+yang+seruPDF 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_off000119c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C3 17516 bytes
SHA-256: 4f7c859a94a827d238731361448339cfc5cc7a4c04918f1cd11bef4e8d2dc7d1
font_01_sfnt_off00014733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14733 10576 bytes
SHA-256: 117df559328690035f42f66c0de49bd1f2d9090108a68da247738a9254b33034
font_02_sfnt_off00015f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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