Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9f5e74e7e16fed…

MALICIOUS

PDF

86.4 KB Created: 2021-07-02 07:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e4122b043cca8078ddf21b4dbecf7dc8 SHA-1: 4f7e0bfa0d4e03ccc1afe2cfc9bf645e791a574a SHA-256: 3f9f5e74e7e16fedd532e1d23a25e7d954818923e6b297a4a4b5209c5f49723e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links and the overall structure align with a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://drafthe.ru/uplcv?utm_term=forming+300+blackout+brass PDF link annotation
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/361bd7f3672b0fdcdb9996fab4cd466a/3417577368.pdfIn PDF document text
    • http://chapelguild.com/images/usr/30439153607.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8480e081db9412f1617a6eab7b8551c7/bujuxagamanokobozeduberab.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/834ddd71afbececa6e948c087336a52c/43989307883.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d5a16d4714defca618849794af542782/biluz.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3be7832c522d758231426b527a8148af/5550533728.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608061daafc9a---vilixawukekalujiwuwiladi.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ac021e76f---nimaxulepavodadag.pdfIn PDF document text
    • http://bakoca.hu/files/file/nelolabukuzusum.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cnbi8ko9638dvaj6cff41t5l30/97861671288.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/lititaraj.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/53006992647.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/tufasalavewekimexuti.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/fewopumupi.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/nokinebunilefiter.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/88717174987.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/89d43bc2111568c967576bc693c89c7a/mesizezali.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/linuredebekimejoz.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/ronetinorukokenebex.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b1467d981cd2170b12d884824382cd6c/moninajowa.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceef1b2c89e---35910789441.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d14cc80a---surajuboxevub.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3e756ceb800d7e21d1e4a63019b309ce/vowaxazosogozudu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 11044 bytes
SHA-256: 731b9c841912c655e8bfd0e6e204dfa75e42c8a27d8aef8fd69de043f14afc52
font_02_sfnt_off00011d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D52 17468 bytes
SHA-256: f6a87497e0e8a4c5a367106287f2022065f6d57326e9b431f2bd740e7a705f59

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