Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f0426b6d083cb8…

MALICIOUS

PDF

91.8 KB Created: 2021-08-08 21:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf393440991b8ee87a45928a43549c8a SHA-1: e5a949f163776dc147e8d4fb809ed07964c159d5 SHA-256: e7f0426b6d083cb89f256d2f32d6abda95a47927e73230a870d340aabe0f6143
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, suggests it is designed to redirect users to malicious content or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to artificially inflate search engine rankings for malicious content, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://garglob.ru/uplcv?utm_term=certified+scrum+master+exam+questions+pdf PDF link annotation
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/14f665fabbda59b002513817f8b705d7/50038589100.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/915267127098ed3a614fe9915c94d540/15688019689.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847727443fa---nimosofonisa.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608620f271c33---zigufifu.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/duxexuw.pdfIn PDF document text
    • https://melz-feu.ru/upload/xogutizunupoxa.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/53357718003.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/cb653edc6954dbafcbb387120378d330/8000515021.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/3jkslu03vjnpn4d22h1hk2gqnl/37127732196.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0705240357---magalilixuwebovi.pdfIn PDF document text
    • http://cl-pub.com/files/files/67709389906.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/leneramoponaxused.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/2c09d86519cbe72495df97a7e3d66dfc/sorife.pdfIn PDF document text
    • http://imoroz.by/upload/file/xowebidebunofujogov.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079892d6e249---52609031768.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/renurawivavepovasa.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/41652420691.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1ed2kvd4gjnv1qvv7hdo3b1bu3/laroxamonuratumidit.pdfIn PDF document text
    • https://istanajp.com/contents//files/2375835663.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/437dd4628510f57f21e2923aaedbf2c7/gojujipusalavurazajedutik.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/brokn9avg7cd31kjqbhk0akb76/nefufixizaza.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/xomov.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/c853ff040369d8f2d7346f6cb1cb0c92/52819062499.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 19616 bytes
SHA-256: 50bc1b24e68d8e2fee43e8b784f8695a1d2b0946d88762c9416139250c7b49ea
font_02_sfnt_off00013b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2C 2688 bytes
SHA-256: 9a130951a291cd9bb0a397a879fce5fc13faa3b3cc1a31c8f2c143422cdccccc
font_03_sfnt_off00014668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14668 11112 bytes
SHA-256: 3369e8c17a7b8bc154447a094ffabaf021cfe990204568c845999d93fd37f453

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