Malicious PDF — malware analysis report

Static analysis result for SHA-256 c105b43a2a4aa19b…

MALICIOUS

PDF

84.1 KB Created: 2021-06-26 19:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1b2ec017b45a708299e5899074b2aa8f SHA-1: da1587fdb7eb1f37074d6fe5b20cb269cb0ca046 SHA-256: c105b43a2a4aa19b4778bbb311eafd9d54067fd7e083a8491c50da8b2efcec1c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=the+most+funny+jokes PDF link annotation
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/43q8qrmq5j8g98h6prap6b8lj0/9953180721.pdfIn PDF document text
    • http://kbchina.de/upload/61136860509.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ce94cb53555f0ec15df80bc39e45b158/35140921600.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160830acbaf824---rejovaxejuwonajoguwep.pdfIn PDF document text
    • http://adainst.com/uploade/files/20210626155610.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d41e187d8c---nirugejuwusati.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/tinedesepatokedufoninuji.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/0727b23c711ef461ca32b49bc5d7b0db/fisoludugixipurilimosipak.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609053c557a81---golewizasoxipobefat.pdfPDF link annotation
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf831147182---nanaveza.pdfIn PDF document text
    • https://businesslife.com/content/file/vexasulomubozisadufogex.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/gapimavumuwozojowinefo.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723ea4cb0ef---62518960277.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/90220083106.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/busewogedowoganeve.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16223989249661.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/c1l1tk0kdlp759hv8pdvgt332o/xaxawijuludo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a97c3119f5d---73062787331.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba2a0c5af7---49405396917.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/10205335658.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/7eddaf80d18d342451c978dc00008087/tusoto.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/1nh3b5795vfvou0tk1l6h5slc1/83124925564.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/gebesewuwemupesuzefaluwo.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_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 17584 bytes
SHA-256: bfe1f90c0685fc7850e59ed5d9e3e056178660004e1e9c875d7b4f949a5e3cdb
font_01_sfnt_off0001137c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 10476 bytes
SHA-256: 8dbc9ae3c5f8b18c052a1dcf4b1e68fb00bc5efe0f4f1accbcde87bf5c6006c4