Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a442a803f04c942…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 15:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 98278381b3700eddb8714d267a09a34f SHA-1: 98c658583d0cc5072d064ccde79843fe78f19ba4 SHA-256: 8a442a803f04c942fcb8539ac46b6a8e38e96524f939b1cf16869d63ed927b72
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are hosted on disposable domains, a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/dizalatitag.pdf In PDF document text
    • http://www.radanhorse.com/resource/files/lepudagewazupid.pdfIn PDF document text
    • https://12shio2.com/contents//files/xulur.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/44243601040.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/11090609000.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/namulojenirax.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ad9978fb5---49517623202.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/18695238122.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ed4e0c39d---duderilugukokilufizadarow.pdfIn PDF document text
    • http://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/81809612056.pdfIn PDF document text
    • http://bjjiffy.com/upload/misox.pdfIn PDF document text
    • http://rentaruedas.com/files/others/wopenafi.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/mobesonapuguwikajozewolop.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccd8e4dbb4---ritaser.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/posigi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf380fbf909---nemojur.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/01ab75a0a115f266fc5a5172c5bc8556/26212926529.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/pufeguviwufaraseni.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/tikozuxuwubulod.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/f15d4b15c4a6e16ecaa9abda87148f26/84492908072.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160927e5aa8d4b---pomitaloreduposomidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=c+programs+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

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_off0000c3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A7 17020 bytes
SHA-256: e5995073f44f5b3ac242fc10d854e72f63a8d606b1ab3ab266faf9f074629af4
font_01_sfnt_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 10400 bytes
SHA-256: 6bbae97078a9aec53593c042dcdfec56ecefe44c0d68ce308474bd4ff24540f2
font_02_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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