Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cf6c1f4c5c2214…

MALICIOUS

PDF

92.2 KB Created: 2021-09-05 06:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d75816a7966ed1af880de4dd67a0b727 SHA-1: 4dd478fdf0f03a3158136e6f8f5f2752402a8e7e SHA-256: b6cf6c1f4c5c2214a681d544aad5e212541e6bbed2096093e3a6ef5396bb2904
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The numerous embedded URLs pointing to compromised websites and disposable hosting suggest an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and its associated URLs strongly suggest it is used as a delivery mechanism for further malicious activity, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://philabc.ru/uplcv?utm_term=operaciones+combinadas+con+numeros+decimales+y+fracciones+pdf PDF link annotation
    • http://www.nomorcantikjoss.com/file/77358980674.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeb67768bd---kudapat.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/mufajurozitazenirugavi.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/ridajumalufad.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/d82mq5r54nfa442rp3tm5h69e6/wedoseba.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/tatutemijo.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160809e9ec5be9---38037449852.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ad0718a7d---33307299246.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/3552300986.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/xixizozeri.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/80956899601.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/jenuw.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/zezovitupogesodid.pdfIn PDF document text
    • http://omni-links-europe.com/nidawamijimop.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607420435c494---50037404216.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/numutabamapinonivig.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a4da48c4d437ba2747c2bd3932f7b69c/xixijesijobojo.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/fajin.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/kumegemupotoxane.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/zidoniwidiliziku.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844f1c78279---vezudum.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ildaqgu9k9kapcpvff8ik6gvfn/84807600104.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/pokedafes.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/12287117090.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_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 20428 bytes
SHA-256: 0aaa2bb5679f5485f9bb8a4d45879be31c48f38d50d54945ffea1f28f8c5dd5f
font_01_sfnt_off00013130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14947 11060 bytes
SHA-256: 633e385606fd20216e0614a4b6cbb02a1424b2cf64c14f9b696e91751ae2d38c

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