Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c15952cb4a79b05…

MALICIOUS

PDF

78.5 KB Created: 2021-07-04 04:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5df769982b80492c19b67a6fbb6d64a4 SHA-1: 5c91410da8749acdd3afad7c586a10eb7988fa53 SHA-256: 7c15952cb4a79b05ea1618770359fc7807c895d0b85c316e48bf2761cd212aa9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or phishing pages. While no scripts were directly extracted, the nature of the link farm suggests potential exploitation of PDF vulnerabilities or social engineering to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://medvor.ru/uplcv?utm_term=upon+in+malay PDF link annotation
    • http://boekenwinkelindex.nl/images/uploads/xixenedegiv.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/89216687676.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aa5361251---mapasevupumeziju.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/b4r6dcdap7n1ss73tl4pjmrdj0/nelisawavonopen.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/faal5s6e02q3t3alod102h178p/kotogusixebikub.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/62799756035.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090be0a76b3e---jidasunux.pdfIn PDF document text
    • http://bdn10.cz/files/file/votefomizukiv.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd6dcdfefc---melave.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/df9pcd2pg38mim6ad6d4kniicb/19892667617.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160945fc6db632---33598352884.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701cd38b13b---63411939597.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/vimupasodepizomobis.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/zukutisurefakiziwevopo.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/187234d92b96d51c16e012ddacc4f263/95609080759.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/6bcebc1902fef06771e88674fab0c6f7/6039485024.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/99702976559.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/nazoxufopomuwujudafilaxos.pdfIn PDF document text
    • http://vejwun.cz/images/kegowi.pdfIn PDF document text
    • http://freeski.hu/freeski/file/mamixirubavadagegekineza.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/u2nr9rji1kbaqd3b7cc0ab2cn1/luzunakom.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ba92c60cb---jixixepi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cd32e3e00---zodixodeparudevikixu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16079e49895dc7---rirefebu.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949bab46062---77118917678.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/9fdf01d6ab2901bfd1d613a56eb1ea59/fexolidoparozoxi.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_off0000d3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C2 10036 bytes
SHA-256: 0e43bb588d9b18b4ed890757e8763512e632e74b053d1a18d9357ee67e52c084
font_01_sfnt_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 16720 bytes
SHA-256: a2e80b06a6e93ae99624a2b5a32413dd16112fa05bf74b727a7f3ff0adbe4beb
font_02_sfnt_off000114ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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