Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e13b78146add0d…

MALICIOUS

PDF

79.2 KB Created: 2021-09-21 10:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e24344f1df54f9201fa29fed352a8392 SHA-1: 4bc4992cfd5eea7d448af0aaadb3dcbb0f9e430d SHA-256: f2e13b78146add0da5020ec1c2d76da7d3ec6a2bec5b0c6c9bdd24f584cbe34c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The embedded URLs point to a variety of domains, including compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://infrive.ru/uplcv?utm_term=english+grammar+betty+schrampfer+azar+pdf PDF link annotation
    • http://rtm-plus.com/ckfinder/userfiles/files/72428341859.pdfIn PDF document text
    • https://eurotig.ro/file/tiruvivadumezagu.pdfIn PDF document text
    • http://scantech3d.com/files/91290905541.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/lepopomewanegefenazotegep.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/gatuza.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/zesumipusarezitaxo.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/xuzamizafegawefejofa.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/43528017407.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/35205861267.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/warokovavoxujevemi.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132f5dab94c1---sokopuwewowabodaxugerepiw.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/n992mphr0g6ceenerh6segv21h/zasone.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/fetazebetotu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1425d3937---62036349048.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/jezowujuguzeso.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/25245093285.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/79808402767.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/62983941119.pdfIn PDF document text
    • http://iphysiology.ru/upload/69252583958.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/49316990469.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9fac56181---tajipeximopikimikabixiko.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433698da533---regotorifikodoz.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/jeleb.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_off0000d145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD145 16904 bytes
SHA-256: 27c9f0d7b4091c8abde056409de07743e94ca4b2ea2218cf83a65c9f0d16e16d
font_01_sfnt_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 11244 bytes
SHA-256: a70061ecdd60a35dab525efb7eb9411c1e4235ed27da9ca56eb84081ec72cace
font_02_sfnt_off000116f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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