Malicious PDF — malware analysis report

Static analysis result for SHA-256 24735b921cbf1427…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 20:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8dc724aa77a53960e5a5e2bfc460cc6 SHA-1: f8c2d828ade0c3dc28ba8615c1aa61f51959425f SHA-256: 24735b921cbf1427662e6e8b033bc336a84a222b1695f44aa4685cc62e67ec21
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://reviewz.eu/app/webroot/files/userfiles/files/jusabotoxulexeginusu.pdf In PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jfn1lrqibgbicfig1c5dg6smaj/77719433136.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210607/210607043014623168d84tr5s7sxjm.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/j1v9vof6mt3c3fu3nd3a6jjtht/muzitisubatazewipoj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d99a6d86071---84567893034.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/3116248284.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/20272039437.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/4qcqm2d73knrqd9im29jcepqbe/60970298529.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/rizewuded.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/10361107558.pdfIn PDF document text
    • http://chayka-svg.ru/files/88154021613.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/09jkb3i3nfu2ogbde6dhv7ibbi/91071911683.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/fivovepizol.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adafdb841ec---23925906303.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/89731bf9746165cea098cc6144f1ca8d/80417775525.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuxemepuromiwaxap.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16077699b2fb04---31677977440.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/pabavatiwafidov.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/271454406102.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/15277062517.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df067f7eb44---xupodo.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/nomidugopuvavofiwe.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/kodavinosu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160845a479e737---fuzoralimosa.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/wamemisutefarojelufuwejis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=published+journal+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_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 10868 bytes
SHA-256: 42c8f76a7201e3dc3f3a1404638824891fc46db4e3eff9340209ec6474967793
font_02_sfnt_off00011aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 17800 bytes
SHA-256: e374a6d98eb8fc864e0e9eb8e7d3443a2b3fb93bdffd7dd27121aff8d046a8d7

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