Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9375a1529f98aa…

MALICIOUS

PDF

74.2 KB Created: 2021-06-27 10:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b8c5283e80b7abceea017fa93a61d14 SHA-1: e7fa24c4fd391bcd398dac72cbb90a896d03b7b6 SHA-256: 3c9375a1529f98aa203fa305763357afeb1c43f557eed5d3f8acbc2404308ae0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage attack designed to distribute phishing content or malware. The use of compromised CMS upload storage indicates an attempt to leverage legitimate infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wastran.ru/uplcv?utm_term=25+ounces+is+how+many+cups PDF link annotation
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c15d7b3b7d2---toromenuzux.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/97cf593a7508db690579ae9aa9c18b6e/fomugetojem.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/37407586948.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/zigozenorotafubi.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160856890105e5---51901539671.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/mr3eikh1u3pac27urjuf3snvtk/18166540092.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/53386351550.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/8401651950.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/9ldtnbi6ljhs4qfhkiaj5g6h41/jesilanupeziwevo.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717dcb13c28---38424032042.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/28483164718.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/lakog.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/voxevipulebuniduxurasabad.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3ecd76610---gaxerinikatidamovom.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609582bd9f5de---karokulig.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8c75e918b7e667eb7cc6cdcf6eb1309a/tezefasofudipopigevevojud.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/705bf26628cd99711cfeccf2ba746bec/22646392547.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b78e7520---70985386605.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/19493126988.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/rokuwu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608763412e4de---nuvutedejemerajujin.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/resikapurojopemakalugi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 16660 bytes
SHA-256: 99281d1894fb4f110abd845745792ddbaf5fea708eb4044a11589dcd12847984
font_02_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 10852 bytes
SHA-256: 75dd0b85a8a36058154a5b928f9277b6f0c8f9bf233c7a8ea01927c1b2c20f4f

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