Malicious PDF — malware analysis report

Static analysis result for SHA-256 066af23741255067…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 10:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a717eb3d7db6e74246b7a80c4a5211b1 SHA-1: 1c64445a2950c1b2bad9a8e4ba476e21abc51a9c SHA-256: 066af23741255067fc8f37da75c1b45072d98e088224addf1a4c5ed115b979b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://laborke.ru/uplcv?utm_term=best+app+for+drawing+anime+on+ipad PDF link annotation
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a73766c6620---48355162021.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/gajevodojutugevavuda.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/rigodiwogazakakasizetezak.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aba62006168---82498802109.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/4086d5576522610b85adf7b1a94540a7/5231430429.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/tijojanefizolukozareg.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/7a288a2660bf395a50ce8d0d00ac4afb/fufuvodilalem.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/5b0eabff5da7d2551e1168a7b08ca328/23138933081.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/36f04im65p9lhon1fr3um474t9/vaxewakokimarox.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/5433460933.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/lalezizixu.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/80207697691.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a24951c18ea---baganivajapopudepok.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/budipasiladoxivef.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///76552954660.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/zixowafa.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/fobiji.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65744875b9---5958922656.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/57885098074.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/6866586fe315c584ac0ec4b290081fee/14294535314.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/67726401017.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jaxinidusiwuwomikuxural.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/54387187851.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wokeju.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/megidudid.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_off0000dfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA0 10932 bytes
SHA-256: 79199a1e1a19003a2b73ba9084b0205b587a62976d547761af70ed79ff9662ea
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 17864 bytes
SHA-256: 332f32b439a7f507c03564f64bdfad5ac0532c1a07c37fd8dffa229fe4802969
font_02_sfnt_off000126f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1