Malicious PDF — malware analysis report

Static analysis result for SHA-256 a977a334901c3b8b…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 14:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89ff8fd052ff2384132aa29112b649ae SHA-1: 7e88b12c6857e713aa5a4ef09c894fe2f94d2559 SHA-256: a977a334901c3b8b673bd553aba2ec3a967611ca32a525cbac7aac9079805e19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=my+roblox+homepage PDF link annotation
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/fitudebovepazilidoneda.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/39031980643.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/digajejipimip.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/17331306529.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/34511514697.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/58974551383.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/jonemaji.pdfIn PDF document text
    • http://labradory.pl/file/tomakapugod.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/6982549910.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/76446486352.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/19487648547.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/84692451111.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/rupepugonerudemupugiz.pdfIn PDF document text
    • http://ccshecea.org/upload/files/73586956875.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/33084697662.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/98294994705.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210904_F30BAD3332B042E0.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/zavosupefudopivezirepasu.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/pojipubogewuwutoxijum.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/warekad.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/nutelewebozekitiwewo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133de4243ab3---78418765227.pdfIn PDF document text
    • http://machulski.com/public/file/88506414846.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/piluwetudubunotewuxiki.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bd0ddf6d9---wupifikikamasobe.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/gesibeji.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413029ab499---bufamaresa.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/wujuraxesunolujoginejo.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_off0000cc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AD 17148 bytes
SHA-256: 1c69c8680b6772d41aa2245583a4a33f6f56dec4cb87ecafd4dcdd44e0144164
font_02_sfnt_off00011138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11138 10584 bytes
SHA-256: 0ff678a8fab8b74ef2c37c6ab04bdc6567f7fe08eba319d044af8fa5f72748d7

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