Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25e09eae315765c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 19:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3057a514e88da117c797a06e73c5a325 SHA-1: 15e2613b9671b8688d6b3997fb5cb036c1e22ca0 SHA-256: e25e09eae315765c4b69df68b0fa0d8741190f55cad0d277bdb18b0aca3d7b67
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://synerhu.ru/uplcv?utm_term=quotes+on+curley%27s+wife PDF link annotation
    • http://redactron.com/userfiles/file/duvunokidogakolasegage.pdfIn macro / runtime command snippet
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c652edb6db---mukulenunumowevilurevuf.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/bojef.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/zedubimotubimubijofig.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///6097830394.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/57726585023.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/lidurikuvijitorogetinojev.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/64398481228.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/zufamunigameselumapiwuf.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/13232438971.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/65605861044.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/fefitowivodokokinaposib.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/77559571529.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379b74813bb---6090965710.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/fewofi.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/3497157987.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/ximis.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/16446655023.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/83705373320.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/44768393536.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b35135b9a7---53360655862.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/1821197213.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/90061871674.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090200181873499.pdfIn PDF document text
    • http://exosushi.com/uploads/files/33527033328.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/63564031695.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_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 18580 bytes
SHA-256: 97dfe2aabc6004d5e8504235b9e292f9ac2aba8a41f5424ba73b83a1c8867555
font_02_sfnt_off00012338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12338 10560 bytes
SHA-256: efd734686d1e3a2119cf998c8569ccf07f0927e26284d74a8705d8fec38aa32f

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