Malicious PDF — malware analysis report

Static analysis result for SHA-256 d212f90976680a16…

MALICIOUS

PDF

72.1 KB Created: 2021-09-05 06:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40517f246c003ab1685ac19d676f0186 SHA-1: b040830b958b9e606f6989d382595a1f227950df SHA-256: d212f90976680a1663f33b9c90fb62810bc9ac6e3c1cb4f085fbe784f2ba9338
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to various compromised websites and disposable domains, likely serving as a lure for phishing or malware distribution. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic suggest the document is designed to trick users into clicking malicious links, potentially leading to the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=cheque+revalidation+request+letter+format+pdf PDF link annotation
    • http://twfbs.com/ckfinder/userfiles/files/dogopobejupopip.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0f2462e2c507a40a0bc7cfec13a4fb38/63998506217.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f98e435672---pugopinetim.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5e597d14dac4eb17c101929741d130c5/xixupe.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f57c63498---lodejobenupidigubizux.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5c8f3202---xokomifakuru.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/bigixixefelexar.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/02dij39lib9br9ndcdbbn5nrs4/20513537836.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/17044403884.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/83770527538.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/subati.pdfIn PDF document text
    • http://glttek.com/userfiles/file/84647724060.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1506f24b1---zoxaxinotu.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/wobimupazurirasadog.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/39b304d1ed10230aa9be07a0f876a350/29345419521.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4074ccfa92---lerabi.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/winunefi.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/luxuw.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ebe27acc1---91573674518.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/34854389583.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/19193028634.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/1651741119.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_off0000b998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB998 11108 bytes
SHA-256: 7b9ddc718b22d7b69953d7579e908dbbdc1173761207734a21ed3f45bab8f962
font_01_sfnt_off0000d31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 15520 bytes
SHA-256: f906b8eec9cbe6071973e51dd0ab102ad4f8d74b1e8cb67d88cd724f01be3c96
font_02_sfnt_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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