Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c3bddca97a40ff…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 13:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15e869529d4a0b1ed2f43a584df6c957 SHA-1: 46f30a65a6d298490bfbc0f09e10d812c6c984be SHA-256: 64c3bddca97a40ff8c954826f1509c7e4cf9907a935b1c57c7bc2d7e16256309
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous unknown URLs strongly suggests a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://szalkasszorutacskok.hu/app/webroot/files/content/files/90952844684.pdf In PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-8/20210908015728940586.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/widuwor.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/babefivej.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///dupegudoxotefimudulemodi.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/731roulgcd06rtttragugv76b6/jalitajow.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/didelanosijefazanelojobi.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/ropix.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/juvuzozir.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/31769030476.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/xuwazexu.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/27956713583.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/2af3e9a7479a6b482bde445dfd40e64d/76288391470.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/20737374150.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/bitawutupiwipoku.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/xebipabudefifujesetumadus.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a05e9f28c---14704540538.pdfIn PDF document text
    • http://darstin.com/userfiles/files/fegapi.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/11679996722.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/zewaripixexetexegaxepib.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/gimoxexaguzovefejonegutin.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/dodobinorusaji.pdfIn PDF document text
    • http://iacsglobal.iacsinfo.org/content/uploads/files/72343570987.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/jusuj.pdfIn PDF document text
    • https://norservis.info/files/files/39690022282.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/8611789373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+recover+notes+from+androidPDF link annotation
    • 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_off0000d9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 18248 bytes
SHA-256: e85f06026c1fdf7f12ac622ac0d476eadb8854903969df3eaa92605fe0283577
font_01_sfnt_off00010904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001211b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 10732 bytes
SHA-256: 23dd6fd0b147e2708b433a808247ad8ca8ed5d7f7c8a4d8b19712f89b7a5799f

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