Malicious PDF — malware analysis report

Static analysis result for SHA-256 945c02fc1edac158…

MALICIOUS

PDF

99.0 KB Created: 2021-08-11 21:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c140093e748bb50814304d70347f40f SHA-1: 1a3b77504b349c560d9d57d1c7f48601a2e8d077 SHA-256: 945c02fc1edac1580160fbd90d8768915d31f34c725bb9e906e0cd2a4d8e435e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV confirming it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, which likely serve as a distribution point for further malicious content. The presence of these links suggests an attempt to trick users into downloading additional malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://kanstm.com/ckupload/files/xavuzusadixefewegefipe.pdf In PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0958581d5---9704366232.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/69cead8fa6fbafcee0de0237c582072e/megiroto.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/linusezimagofeb.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160813e672fe2a---44303149146.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/eb8512909bee35684b0e553bb01298b8/ripidaworogovijiv.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e7fd02709---puwafikasuzepobimamerewip.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c89a2be49---fepumasadevokefupoxop.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e53b156af---saxaxezexemajadazemux.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210625_035918.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/wejolilakururile.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/35549609828.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1799b640d---61967320085.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3265b058d9c708dcb2e71dc4fd251a2/vofuxolezulab.pdfIn PDF document text
    • http://cochu.net/resimler/files/47705813186.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/3ed19430d3535016e5fc20eb6109cb7b/88861683414.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19468bda08---85565346374.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfb6fa5acb---tedavopuditabivekovixunaw.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pamuwowodawemubiroxa.pdfIn PDF document text
    • https://estoniapools.com/contents//files/50023250073.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b5c7ca82a5ebc40e704463c67876bf3f/81145571437.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/zebufug.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/cea27cdc6cdd1bd52600776b5be805d7/4949373424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=spektrofotometrik+kantitatif+protein+tayin+metodlar%C4%B1PDF 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_off00011b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 10820 bytes
SHA-256: 4c76b3aded85dc1c01003424cada0545bf18dfdbef03675de08f02c0abb16bc3
font_01_sfnt_off00013440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C52 17704 bytes
SHA-256: 4f6ff994606822755b3b57785d8ed6ba4004c8ce66ba8d2656374d904317daab

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