Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95b9e0844ec006e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-02 04:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 90847540a6e25d43a9d8676f9ae7f426 SHA-1: aca9e905a65687f6324501838511af0b1e247951 SHA-256: b95b9e0844ec006e571ab4b65e33b6624e83890f95d8238963b6d39efc2e1956
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=how+to+get+gallade+in+pokemon+shield PDF link annotation
    • http://9262895.ru/ckfinder/userfiles/files/69348890216.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/64282272280.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/00c1ff789bba99bb737d8a312843cb3d/sizepesipare.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/vt2rfntr9nruif0l13ca0td7u1/55485734702.pdfIn PDF document text
    • https://tigapilar.com/upload/files/36440676482.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/fupozuroneralilanivo.pdfIn PDF document text
    • http://fygl.net/uploads/file/161833251078.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a61545ff44---4274946944.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a49a95b36---pilububuwizifabatowarokiv.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/vavezinamu.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/gunewiwudarelivar.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/75687500685.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/niferuwijenofemefukute.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/nufupigun.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/aacca69fdbc7d093ca05636db2e40832/pafibaginawuzavar.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/66062798528.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd091f3724---zanuk.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210608_150705.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/5cdc5ed59f80dd42426cb48e651b4119/rowezitetokimaviniriwesu.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210831_210058.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/gimevedotodomezisuje.pdfIn PDF document text
    • http://schubert-hh.de/image/file/45400606684.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/nonadep.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_off0000b6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EC 10908 bytes
SHA-256: 6f5601e7d06b6cddd69df0123483dbb147b512489891be957d805a612e50904f
font_01_sfnt_off0000cfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 17932 bytes
SHA-256: 1022f8a611467e48f9b3ec3e41f4c480281a46946a61d4bd8950e6c8b55b2c12

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