Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff749009473fa173…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 04:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3a0d8cf414895944711df91f3f686db SHA-1: 284b0007aea2c1952b797ffa9aea9a2c602986c7 SHA-256: ff749009473fa1736bb3e5fec0ba4635e42c48667f3f490353770bd041128bfb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or phishing lures. The presence of multiple external URIs and link farm heuristics suggests the document is designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=dr+nowzaradan+diet+pdf PDF link annotation
    • https://asiantms.com/ckfinder/userfiles/files/zitekobarivefibuzivasumux.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/kovopoveza.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/d9bf4ad7da138940a787227d0e57a81d/gogino.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161308abcc700c---17914610189.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/31630115212.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/jafipili.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/furisesekoxoketavaxemoliw.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/31173785105.pdfIn PDF document text
    • https://aitalk.vn/upload/files/juwew.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/dijilavojir.pdfIn PDF document text
    • http://orderkai.com/uploads/files/76705498767.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/gofirugekulun.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/pexutawiwuv.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/69111785499.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e31d97b1e---24448160002.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bd2f478d685d2a0bea4dc8926cd49038/jifalupozedunawi.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/bozutezuzomupigolag.pdfIn PDF document text
    • https://btegypt.com/file/kagikonelepob.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/rubakosegax.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/rovalidizofaturepuvunuto.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6e4106b2fbb8759b24e437c8a8445d6f/jutoletopisutibanasudijas.pdfIn PDF document text
    • http://agilesolutions.in/uploads/4262587126.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/fomatelovogutawubowol.pdfIn PDF document text
    • https://mollis.rs/files/joxifezixawim.pdfIn PDF document text
    • http://health-bridge.in/upload/file/40448297065.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_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 16604 bytes
SHA-256: d798ae38c27ee14b92eeb1a88f2ef2a77d6ac15b5d7457a60cc40ceed6941bd5
font_01_sfnt_off000102c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 10424 bytes
SHA-256: 49cbb0957c9f20e890bb920ee877264353bab6bc0ab20273735bf4982c074691
font_02_sfnt_off00011a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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