Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e1c4ac8cfa3368…

MALICIOUS

PDF

75.3 KB Created: 2021-09-25 06:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53e712ac5b2c332fc06533784823b412 SHA-1: 3b25d931d6c25c4df12625f233bd173f4c1857ba SHA-256: f5e1c4ac8cfa33681a1900bcd1cfff1010c7fa7ed1d871f96d7c58220f7795cb
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://medvor.ru/uplcv?utm_term=onlyfans+unlock+apk PDF link annotation
    • https://condominiovillage.com/userfiles/file/23838067166.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/xunokivugosowesodezube.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/39338965948.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/wutupir.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/66699875089.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613234f623ab3---59766811398.pdfIn PDF document text
    • http://thepducphat.com/upload/files/64361652729.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/55516881850.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/2452670304.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/39975660358.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/gawulunanafidagusizisazis.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/gitosobadobalube.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/jivogaribenosanevubijilu.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/sogutawoxijakozelewixub.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/dapapenufakuvuzono.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bcc44c51c---77392203231.pdfIn PDF document text
    • http://clingac.es/d/files/rusezepenesadex.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109131352538476.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8618ad84a---jatugovapibizisonewu.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/fevenabemilexam.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/95568788445.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/kebafola.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_off0000bbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFC 10384 bytes
SHA-256: 29604a2e93a1eccb9301a43d70dc0b1c85f5a4b932b71f5a099d1ef4e4ecec30
font_01_sfnt_off0000d3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 20424 bytes
SHA-256: 16e8fd877d72f327d885ae74d9500293b6e71c295f7ea0348d4d08cd8fa6f4d0

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