Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bbadaf75f9cee1…

MALICIOUS

PDF

86.6 KB Created: 2021-06-06 21:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 448021cbef47fe08df637d041de01167 SHA-1: 5f819c00826f5e0b91f3c215fa56a2ca0afe2a70 SHA-256: f4bbadaf75f9cee1c87feb7c2ff1317580de7f3aa2d8358c2ad473612035988f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://krisoc.ru/uplcv?utm_term=kkmoon+16ch+dvr+manual PDF link annotation
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c58c223f---mijumaxibilu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/38339048974.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/fa68f8cfcab545b2e3f5427d1ca8e3a1/nelegimazukisomu.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090f288315dd---ledigulinawewanevixinoruw.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/babojiwibunafoloke.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/v4170mfsp08e3257jhd533pb9l/musanijiluxitilikutibobat.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/dilawifebafozetimuja.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/ravuzipu.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5e1bb9874---6169677844.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084751833330---68630381750.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9687dd1a468ec4503923473a39386c82/81177351060.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/13a77880cffb9709e0b66151014c23ea/fajafozagunigetota.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d576880d59bf3af5a2e648fcd0cf203d/39179997366.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/l6brp3kn3rm9cad6cod8mfh2uc/5705186014.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/88116f164f8edab942bb7764114c222a/nisuwivub.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fcf843556---15481548913.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/82656467056.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000128a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x128A8 21224 bytes
SHA-256: 0f3ede1eb23d79165228816bcd9885c6ec83c3ac3d438cf8f0c787d10326544b
font_00_sfnt_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 2960 bytes
SHA-256: ffe008f00bdab04e42d0fb58581e94ebe343bab047a3ea3be819508d06260cf3
font_01_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 5300 bytes
SHA-256: edb7dd3f0209fd01ac85135bf5c470ac8d7e6ff3150eccc395b6f7d7dd9a7b9c
font_02_sfnt_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 11840 bytes
SHA-256: 1be4e1283cf0bedbee0c1a5a6925707f6192f9b7c6a8f17b4c641b7068b54e90

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