Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7b7744ff0e7a4b…

MALICIOUS

PDF

86.2 KB Created: 2021-09-13 07:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3dc4fbf460393718acd707d83c432de SHA-1: 41d9226d89c5d4dfa7a464d8441ea74784418459 SHA-256: db7b7744ff0e7a4befef2abe4ec5e85cd6f64a556b1d1b2f8a0ed0157102373c
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm heuristics strongly suggests this PDF is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chcial.ru/uplcv?utm_term=text+generator+for+android PDF link annotation
    • https://bvphcn.bdata.vn/upload/files/tupumizek.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/kowegojeber.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613739e77f3ea---janubuzuwonajup.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/41722195555.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/1621328374.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/jasodefipinikonopewu.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/86183767293.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613746bf1990f---50508297785.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132a6dd83372---95659289885.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/93741297378.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/26355919380.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/xebudusizutusir.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/11080752031.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/vekebefowadaguneve.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/ribidujuf.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/rekovibesipimupatu.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/dizanexudumegiwagaj.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/25987f2933d120497838e141265ccb2b/46811277681.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/57324210257.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/72520179542.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kudezapage.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8559a0afee63bedcb92fec2f317073b4/miwib.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf859308d---latulexebijofikimurilaren.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_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 18416 bytes
SHA-256: be11aaec74f3c8c93541af196aabf2a87ae61934ab636c363c4f31f10b067050
font_01_sfnt_off00011c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13464 10380 bytes
SHA-256: 19c5ed6d20f27367071c5d93036ab5b99cf746c37a4fd72f804f8f6fd54d2688

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