Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b7969d0fcb0c10…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 10:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b2f65ba1cbc258bdd376b3597072dc62 SHA-1: 3a5b6dcbde6c863fe2ecab9fa65910f094cce328 SHA-256: 43b7969d0fcb0c10caaa89fbc9e13eb743778ad9966acd0b428ca1624484658c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the primary attack pattern involves directing users to external malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=minecraft+how+to+plant+potatoes PDF link annotation
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210715162343.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b34de9ba---walobapidovanisa.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/bubagofizakapasafuvunazo.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ba43d15690---miregiremufikali.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a89e6104253---bugefekudikuvovivudiza.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160753f29b203b---36999537169.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b8f7e45b---dulukoxamaxirapu.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a500da34450---73221778578.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/0m2rvlcm379r4v46n9u4cngq38/59489338633.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/015a63b0516bf53a270a2a2460d67897/tadetimoxozawuz.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/komefex.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/2881574578.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7d50887ad521aa744b4fb8f77af2c81b/fewexurozegametu.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/52bc68149b62238ce0a209335d488ab2/48564177531.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/93292683604.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/wewozel.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/6795243381.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/garasajetizotimosixobe.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/setepedezoloj.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/24733982015.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ed5b9c7a---46506605468.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/gezawaperobak.pdfIn PDF document text
    • https://petala.gr/userfiles/file/42086342873.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_off0000dc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0B 18412 bytes
SHA-256: 66d304be8245658bbd697172d2c3dec825988c27c3ee734c4cd9ce9385cbc214
font_01_sfnt_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 10656 bytes
SHA-256: eee264fbd2e72edf31cd38b14c18d82658ba95dba087cf673b040e6e0065fef7
font_02_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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