Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f57bec9d3a9857…

MALICIOUS

PDF

71.7 KB Created: 2021-09-12 09:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b4e2b8fe25f0138b5b3fc888e8764bf SHA-1: 88551df25f71d2c7e1ece1538d8df0858fe38463 SHA-256: 59f57bec9d3a9857cfac76cc053f8ee2d23148629d56289a0023b2ec0881fd3f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm is a common tactic to obscure the true destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://cructi.ru/uplcv?utm_term=research+methodology+and+biostatistics+by+sharma+pdf PDF link annotation
    • http://studiozammuner.eu/userfiles/files/1474959191.pdfIn PDF document text
    • https://rintrans.com/files/20318376159.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/07138c6785c33a42a903e256c2d71a9b/nikuviwanowodojizotufupet.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/siwubuxedasenalineze.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/10046858258.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/15390003503.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/37566528272.pdfIn PDF document text
    • https://penzion-palice.cz/content/77995621428.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161363887cf50c---penifinedemuzebex.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/gopomu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5089c88350f944ce8b940679d1f54652/dexezedazebeda.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/kowiwovixobelaxo.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/neguxukuniguwejuvejizux.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/87236974135.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a8f9a8b7---pobarosam.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/97365720977.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/nefiro.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f41c190fd1---nenesodimibar.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e7371d582---xolaxidedipivexoxafokelu.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/gopupulorine.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/10281450355.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/99383034725.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/51200256812.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_off0000b554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 16284 bytes
SHA-256: 19320ac78c465658c5634a0a334c377e1f2cdf29e8a4c39336519f6aff8d5501
font_02_sfnt_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 11364 bytes
SHA-256: 440a7bb814a7c6c3bde3034fcd46a893b4b852ac8cb03616303e0f161db3bd17

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