Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a8cc2f728b6d07…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 00:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3bf2ec54a321721a84571c55b0eed280 SHA-1: 56ad4c059675ea7cb857bb098d8fcf03b9971cc7 SHA-256: 12a8cc2f728b6d07e2808f3d432c8306f7cd62d019bb075424d8fba55a5404aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised or disposable domains, likely for phishing or malware distribution. The PDF structure and embedded links suggest an attempt to exploit user trust through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://springgalleryng.com/Images_upload/files/xeruwapivekomuvenewidegok.pdf In PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/vubozevopinem.pdfIn PDF document text
    • http://emannsltd.com/userfiles/vedarolax.pdfIn PDF document text
    • http://wrhsclassof82.com/clients/d/dd/dd94ad2327da436b0bfbe5937c3cc641/File/wonadadiv.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/lubusixufadoxi.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/46a5afd3f170532d81dac04ce5f73023/vesegoridiniwuzexoxabex.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098af1aef4f6---37059664931.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5cca028176edf7fb530e5197d8eb8407/gexexafalibamup.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/rerawisokimitemutegi.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/salorigabulamapota.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f53c659d9c0384264d45080b0b0a7251/vodidakamevawo.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833e0c1d3e5---78883349027.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7abda50c---92798796660.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6e003521a---1160417654.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/mamixamapowobo.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/fajupokidube.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/xolubuvutokogomenu.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/59223065944.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/71772818288.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/54342890961.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/ximolokoxesekotema.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/seridujuzemenumuweburusi.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9921156bbe508b302703ee0ab0ed98d4/mexumosulozikabalived.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f9a4a2cd---59488200321.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceea6815be2---mabokowirix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=romantic+painting+man+on+cliffPDF 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_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 17792 bytes
SHA-256: f06a61ae908caa39c3d52e50976457c705402f90edf020f455626d167eda8e10
font_02_sfnt_off00012059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12059 10468 bytes
SHA-256: b74a54357e22c6565348a13a269aa9de8aeddc03b3a7490493445dc52fcc4c92

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