Malicious PDF — malware analysis report

Static analysis result for SHA-256 7340f52c530981f3…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 04:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d5496a3b05629b789c5215408b269a5 SHA-1: a61555de2d5fa355fbab08849765d3793763b8b3 SHA-256: 7340f52c530981f3e1ee5ede08e35fb3e8717120c2ec3eb1bb6d26b3ee26e062
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm, directing users to multiple external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution are characteristic of a phishing lure.

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 http://fullx.net/files/vaseza.pdf In PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/bojapegujupukuxanonupa.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/84f2dff97f98b7496b1e870e9aedbe85/xowumeb.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/jumusesokubin.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c85a240649---jusipojixibiwagofek.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/pegesitorofitaxomokudu.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ab7f7d0fa06e0a133098ac7722c5247e/14701263311.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52143a4f92---pobujerilabi.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/62116887409.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c5b9e9b7bce7f52adf0fe3ba5aa48e95/podubi.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/47518459517.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8ae014525c38315da966ad3c89144977/28627779974.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/wejisedevulufoxuzoneviba.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/togikonadin.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/lirukelitejovufajuz.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/leserapiru.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/xonuvubozedivizuwini.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af1f1640d47---20633630009.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/kemugimoxaw.pdfIn PDF document text
    • http://yuha.be/_files/file/18633214102.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b99a523c85---46003296304.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611872b209ae4---kixofisap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=corporate+finance+core+principles+and+applications+5th+edition+solutions+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9E 17092 bytes
SHA-256: 517fe577fac3f543de4fe3cd89c73ba4041980a2fb3ccf63b08700719bbdec37
font_01_sfnt_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 10980 bytes
SHA-256: dbfc58bbe09fde82c1610b618602d15c8e39f6dd34161bc182edc99cf480ab33

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