Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa9f32c7965d42b…

MALICIOUS

PDF

70.5 KB Created: 2021-09-05 15:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: bacbef2cea0aefeb352d06accfe43469 SHA-1: 5290a94e8d9e59be21d894f0ec0ea1bca6c1488c SHA-256: caa9f32c7965d42bbea4c9fe34c55228b2205e09db3f7e5665c8da4c6737584a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://aarogyamedico.com/userfiles/file/20113010300.pdf In PDF document text
    • http://kulturazebrak.cz/userfiles/zajisomaxorosufu.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/rurafizedipunikipav.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/kunoxewobuwenagulawo.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/bujuxuxubazixojen.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/jidolofusoguv.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/rekog.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/87122264068.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/90345317480.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/96282563937.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/13034505518.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/bafulugatowosilusos.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa4b4eb577---92064071906.pdfIn PDF document text
    • http://fullx.net/files/15885788745.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/36552892081.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/fijivotetenesegukev.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/59394492866.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b5822d33---gesexivadewufabe.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5d3a78064---dunomulafakituv.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ko052fcp2e08amujf3p52hd4q7/pidopozirovisedozojuv.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/zagunetupatepaduditumoze.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f339b276d1---2027022406.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/mf5ndt802tdoi0pl9b6her02t1/lasarofiwususuzekabe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a092a7a0ce8---delesobupolu.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a90f5c58e8f---88813669220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=drayton+digistat+rf3+manualPDF link annotation
    • 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_off0000b80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80F 14064 bytes
SHA-256: bb60933ecf7230d15a25884d971490d33546a0c68f2be9bf706a58cd829a4d07
font_01_sfnt_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 10952 bytes
SHA-256: 6aed87bf132ad70fb15aa64b90ea8957d2ebb8a03025a3808b0053131ab450d4
font_02_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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