Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd036ff007f1180…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 19:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f96cd2381def4073f95d5783714857a2 SHA-1: fdceffa3ccb11bcaeeef252c93a2feb9f413c208 SHA-256: 3bd036ff007f118028194722416f326c0df06c58ce8d18248185617da4656440
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content or phishing pages. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=kinesis+freestyle+2+keyboard+manual PDF link annotation
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b83b8b8036---47669667257.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/37846399662.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/64996ec85b9f5f41e1701764952675ed/givovijujebifarisa.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/87981330879.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/84vcld90n953edvign61r3k8tu/5053946026.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/judumunezekeza.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/17162975968.pdfIn PDF document text
    • https://eurocomm-italia.com/file/96638093834.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/38986626847.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/muniwimujopipudaguwokevid.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/73943385760.pdfIn PDF document text
    • https://mmszke.hu/files/file/kemovox.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/jugaxonufewowamuguk.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/70477473185.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/gomusipodexopozotolivuda.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/89510845571.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ae43a8f4e78c5a53bbbb3a3450433d51/patesigijevakovesadujot.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de69538b2b---tumutolodukumifowadekiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ac51effcf---relotedetedibedawotoveka.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/vo8v9b2os5t10aadf8kdtnno6q/jabakozafalusilemafom.pdfIn PDF document text
    • https://eventaipei.com/upload/files/97698905353.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_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 17564 bytes
SHA-256: 39168959284016301cc59acc2436c8f57a82ee96a393802321e81bae24e3d99d
font_01_sfnt_off00010fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C4 11072 bytes
SHA-256: 20d281db3b10337377e369fa9788afef7ba8e164a89cceb15088307f87ebebb5

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