Malicious PDF — malware analysis report

Static analysis result for SHA-256 774b9e22efebd7f9…

MALICIOUS

PDF

84.6 KB Created: 2021-09-14 08:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 145b8c3cc2ac2f09a39940cf0810a8e1 SHA-1: b596afea201de6e78aafee6c9465342ca748cb13 SHA-256: 774b9e22efebd7f9f4c62f72a80cfece5bd61faddfc9ef0eb89d830a3e7c2450
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=apps+for+hacking+games+for+android PDF link annotation
    • http://oldstat.ww.tj/img/file/21205894682.pdfIn PDF document text
    • http://101balkon.ru/upload/files/38249236723.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/pojilepokimose.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/b070dbacaea28f1d222c87e61090584c.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136da2fe68d3---girifofikamemakugirikuwiv.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/478b4e6fdc423f2e41ba76d485e734a4/70642826015.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/matanepirede.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/tukanukefuf.pdfIn PDF document text
    • https://egca.fr/userfiles/file/pedobiruxori.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/80205502704.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/835f4d68ab2b4dbd545af3a5c5ee84a9/46329562527.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/sekozagaxafezukaxuwowato.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/62746414880.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/823550451.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210908010750_c5jj8g.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/044f500a4b7b18617685c79edc64a0b2/lesuxev.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/tamazukejukelosadobiwe.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/67634638325.pdfIn PDF document text
    • http://generoussecurity.com/uploads/20668475175.pdfIn PDF document text
    • http://lactopad.com/uploads/files/towopuritul.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/wozotawijuvogudogolarevan.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/55663632059.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/ruwisufebizop.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/24294331343.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/nozewirajebuviwon.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_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB8 18644 bytes
SHA-256: d2f7fc0d711c2520b5f29be63f1c6247bb4ba266f177b915ac210fa72b79343e
font_02_sfnt_off00012b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1D 10996 bytes
SHA-256: bcefb3c484ab3d9cf9718988d7927e56b97ff90b8dc0e0eb4877b4116e966166

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