Malicious PDF — malware analysis report

Static analysis result for SHA-256 081e50b5e5f3017a…

MALICIOUS

PDF

143.8 KB Created: 2021-09-03 20:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 098bd7900c5490df4ce72c3583a57837 SHA-1: c8d5f57570364921bcab29229adf7cd52ee6eb55 SHA-256: 081e50b5e5f3017a731b3e1c48c02eb778ff63f9e74b6b2f4f803541fe81e615
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL targets suggest a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9610

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://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/nan5c89qn94sd16hf2gnip9iof/15208103817.pdf In PDF document text
    • http://thienthaopc.com/upload/FCK/file/numokusozoguvinej.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/55279710924.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/73659864923.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/46476308695.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6aed8e672---46224435595.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2938eea2a---dafodejarimilifiluvefur.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/tirojuremanabapimobili.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/44f7776edeebbf70d1c66068f8205e28/zadilapadipuworag.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc36772f2---datirureme.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/pizizapiga.pdfIn PDF document text
    • http://bscartridge.com/pic/tugujiga.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4cfd75501---bomizufaxeketosobi.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/wabaga.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16110b4d946ddc---10655240284.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf13baf23---16929435624.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160f7efb515384---geruzoje.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/c87e7ff5980cef9cd865bf342e916660/taronebovufija.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-29/images/files/lotakavarevejifijavatajo.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/rimuvogamuxiz.pdfIn PDF document text
    • http://coffee33.ru/archive/file/zivuf.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/um5f52vljj6vj2efmukcqu1aq7/jugumibi.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/xogisixagipaxabemuk.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236a9a35bfc---fujiburodexoxarajikeremup.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6dfbbbf768037362f3e68d0953ffcf31/5293914860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sony+walkman+am%2Ffm+radio+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EAB 25780 bytes
SHA-256: 5b4253b168cf2cea744cd9b87c9c331663444306b6238b9ffdb5e7e5ce77e890
font_01_sfnt_off0001defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEFB 10616 bytes
SHA-256: 00adcfe828b02938f8e192c139454a5d7ff47ce0b464bbc1fa0743336b9bdf2d
font_02_sfnt_off0001f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F749 16532 bytes
SHA-256: 0bb8a8cd9a0924c4275f0c0189b222e873207a184779b993ba5936a90339a836
font_03_sfnt_off00020e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00022689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22689 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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