Malicious PDF — malware analysis report

Static analysis result for SHA-256 613f4dfd4edaadef…

MALICIOUS

PDF

94.7 KB Created: 2021-09-06 11:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b7fbdd68d427dfecae12fddc53409825 SHA-1: 24a0503b6c6955376f5978320b23e3c6c3e416b2 SHA-256: 613f4dfd4edaadefc72c328340345cf64c7de86b61cb9b6d220a46495a8936ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment scam, intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pistant.ru/uplcv?utm_term=honeywell+chronotherm+vision+manual+english PDF link annotation
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0b2a865a62f48e5f1aef749926241cba/gamulolejemanu.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/c2cd0e1ea5667f011d63550abbaf0b8a/notipetevodixapapiludizox.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/46915652400.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e12e01bf1---degebiwotipupar.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/vekofoxave.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/541d1aa614f9d1956e99128f206c1f42/45884453542.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9bccc22794123c68b136e0c88d4528fe/84106807671.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e30910da50---kalotinof.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c21321ef854001f5fa813168ac0120e3/75140297976.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/dovunegijenej.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a7f9e08c079c02dbaabeda6e15f68dd2/94892153837.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/2326360119.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/vojidotetuvaveti.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5607bpvl0kvdoqbu9hti19h782/nawimudakalexenewurud.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876500cc6e1---lenamamepisidi.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/sedojopitavuwuwejonixal.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-8-13/20210813014825398420.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/sixowufubizojiguxazajowal.pdfIn PDF document text
    • http://minerva-collection.net/files/files/89967786050.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/xedam.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8b6dc55e695de338b65c1a10bf84036e/rademewufaxezo.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_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 20604 bytes
SHA-256: 3f12e2bb3a0c276283545996ed6710e228d8aa60b3fe27966da7657aeba075b2
font_01_sfnt_off00013b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4E 11036 bytes
SHA-256: ca929dc79420653dbd5a4a1c332982ba5487c5ff84148d9ebff5c846d791df85
font_02_sfnt_off000154db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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