Malicious PDF — malware analysis report

Static analysis result for SHA-256 950f2c9d03ea7ecc…

MALICIOUS

PDF

89.9 KB Created: 2021-07-30 05:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 73764e1fa87014d98ab2c1fd4679cd94 SHA-1: 9e2941ec21e9415349cf7631249396b77cae7004 SHA-256: 950f2c9d03ea7eccf5841f0a7105c75722e381f86a4ce3fcbb32466f85d413f3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/uplcv?utm_term=como+salvar+arquivo+em+pdf+no+word+2010 PDF link annotation
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b84c578c78---18561770769.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/54f77fd6050931d3d1fcb89ca457e46f/falisitikenowab.pdfIn PDF document text
    • http://93564497.com/userfiles/pawapakawumezubivolato.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/77602722067.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/pimufowerugekofoseduvi.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/59401409745.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607596f9cf0ce---39419051673.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f971c0f813445dd19390bca2592a5862/2613562487.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/sofagajavevira.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608923b2a13fe---lujuromalope.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/314c297p09db37k6mc1failiqq/61567002358.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/zenifajuj.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/50cf831cdad5d77ec9086ec9794668c4/42691284102.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29d824589---70641430547.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/xinadugiwukidu.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/zagigopuralu.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ffdb814a3---rukeradavadupumewubom.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/82b913fd5a63fccd611c3b9ac28bf073/tumewupokiwuxiwif.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/56384001863.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38465121228.pdfIn PDF document text
    • https://seerupit.dk/assens/file/ribon.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/33992581100.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/17539807520.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/55910420158.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_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 11284 bytes
SHA-256: 0c03eaeb008a78b7f8f63bf0e2fe2cfca4f544a214c6648954f02f30fb346efd
font_02_sfnt_off000126ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EF 19108 bytes
SHA-256: f99a7b0b5ee1773cc85ffbc37a2c2aea0dce36b8563bd21abcb93eaab2284f63

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