Malicious PDF — malware analysis report

Static analysis result for SHA-256 64171008241aa0be…

MALICIOUS

PDF

88.4 KB Created: 2021-09-01 19:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f093246f8e3dc7867eaba26899bf4a14 SHA-1: 2bd339ea0be226f88f8a50c37b81a4e115dcd1ac SHA-256: 64171008241aa0be621ee87a3f6ad0f7645fb3eb9418889dd23d7c13350e0ed3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised WordPress sites and potentially malicious domains. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nomylo.ru/uplcv?utm_term=difference+between+fiscal+deficit+and+revenue+deficit PDF link annotation
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160762ff877ab1---jatinewap.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607343608ca62---6269208142.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/07pteh227nde5sogevhme97ir6/bewasogurajosozemo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c615ec75a10---55942825724.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/meruwudesukoladanunamam.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/41345247295.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/40981261488.pdfIn PDF document text
    • http://learningkey.org/userfiles/95531489257.pdfIn PDF document text
    • http://inphilong.com/upload/files/89544676554.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/9885686e7d5831d10ac72a65b224003c/51808074055.pdfIn PDF document text
    • https://mattress-leader.com/media/27132253483.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/raxib.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/gobukivesewo.pdfIn PDF document text
    • http://creationart.hu/files/file/zurajadefezunutozavijune.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/gexikalamezilimire.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6126da8859---46189061577.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/dovikufajetenilurimi.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/64161323058.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/25826811073.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/lopeverekovavupofatipepo.pdfIn PDF document text
    • http://packturf.fr/files/10570850330.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/79036248052.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/64610207024.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607096f07c5dc---ponesafosakivajojegodemo.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_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 10744 bytes
SHA-256: 384706a153f6ee4e0eb8af1c63c20bf27de38eb8ba2d74a5f906a2e43434046f
font_01_sfnt_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 19744 bytes
SHA-256: 45d663a77974cf9d79ee63d944bce33b4114aeccfca5ca5dfa4f9c4a057a10bc
font_02_sfnt_off00013a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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