Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b385adf7ab0b32…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 01:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e76e47deb715c4879e1a72fcbc39a417 SHA-1: 61f025c0bf42b36ce056485c8ee0c23d9f8336db SHA-256: 78b385adf7ab0b32af73103128e60ffba59ea86f394ed88710de9a17050737f4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://location-appartement-venise.com/italie_documents/files/15834846814.pdf In PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/44129518309.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/61473574201.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/pifuzad.pdfIn PDF document text
    • https://fratellifurloni.it/file/xidokixizaruzalenoroguta.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/83852489520.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088a219b1c3a---gitebixufe.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/vl6v4lds4aho43ebpr29bqo1fk/87877140580.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/wiwafavamupetoku.pdfIn PDF document text
    • https://iwistw.com/upload/files/66886426745.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210627080146424.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e513fdb7859d2e92b09fed7d90bc0438/35405333690.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/linenuvimutorede.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e250a0e76a21fd01e31b4f3288f31664/29299616800.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/dexesozevufuzinusiso.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086659ce9f78---nejegu.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/gufekivomupixuzowoman.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbadce7db90---wamizaven.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/60892952435.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/zanufugusutejuwuvum.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/22848511970.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202108/1628477163.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/kelezozifefenujerivitor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fordyce+granule+adalah+pdfPDF 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_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 18036 bytes
SHA-256: 3f204fb223a49ebcc31889a43568f19736f5cbcf7a413d1095bb76143f4c13f0
font_01_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 10732 bytes
SHA-256: eeabd9f39741b3a9b7f15f14f3b6565ff8ca01edfc31f0f221deb02f37410546
font_02_sfnt_off00011d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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