Malicious PDF — malware analysis report

Static analysis result for SHA-256 777c7138de30894f…

MALICIOUS

PDF

98.0 KB Created: 2021-08-14 00:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df178e4af992f358479950569e14f449 SHA-1: 9dd29781b13d1d9cb77dd7d1154a7dfd864f5e67 SHA-256: 777c7138de30894fb73ae8550d47bec4aa55ea40251cab23f2237f2af47a93c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://medvor.ru/uplcv?utm_term=el+rey+midas+cuento+completo+pdf PDF link annotation
    • http://vinmexindia.com/uploads/78081510814.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/b2307f767ffba524536eec64309af12d/bopejonubixijisemamipuxes.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ac6dfd9178204e0d6d0948f67e580f72/64028081591.pdfIn PDF document text
    • http://hncastlecable.com/d/files/10662009135.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c3a5491a13436876e31d76f780114ca5/426429430.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/kuxameveru.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/bgjj923u0183mf96k58df7sus8/nagupot.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/zilosuburekelaletawu.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/punamudakilizaloxe.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6339c1123ea3bab4e786501ce25ddd16/68799588415.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210630092118.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/55bfb8b448087fd05bec82b03f200186/rekaferuvetemijak.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/796f4b9ec32e9317175760607948ec97/71820716186.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/l0ljgil2ich03n2rempu266cf7/19259226243.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a3f1b0521---nigosapasofosi.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/77f65b71b385ac16c62c9ab8bce83e6f/59654210718.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/pilalifupulekakarisaru.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/xaxejevutezer.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/c4dd8ab0ab30622a016ba7133ea2c869/7067912008.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/680984269.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd58872fa8---3651449212.pdfIn PDF document text
    • https://latework.cz/soubory/60193252991.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/dapewevitelikifagak.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/28241489886.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/jojubodugape.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 20812 bytes
SHA-256: 30b33f632364deaccf32047943e7a83de4f984267a40660651861e2a1a78410c
font_01_sfnt_off0001307a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001488b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488B 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_03_sfnt_off00015dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DAC 10976 bytes
SHA-256: 037a0859259a7fef46a7d29168589ec7cde0fab857f023845c98c256cd1dea8a

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