Malicious PDF — malware analysis report

Static analysis result for SHA-256 748574b004f37909…

MALICIOUS

PDF

94.6 KB Created: 2021-07-29 18:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 769a3b09848e4b555674932020946c76 SHA-1: db9ea94b91c46b2ecefb8285d830d394c697e3d6 SHA-256: 748574b004f37909a6c3db88cea4a5a38d77ce60f463ae08cd8322ec39613691
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and a high number of links indicates a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://gaongonmaiphuong.vn/webroot/img/files/51589721023.pdf In PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff5192594d3---riwebofixepagerexag.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/3775b97c4c15f235c6ffb077d9bde561/gozemebipaja.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5773850f9e---basepujakig.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c7f009513---9139444595.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xoduvasopugo.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/rekaborunuzosulofegux.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/28974324069.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48bfac9378---62687800052.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d0895040a---kabezezasetigoxune.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/8225125334.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/4069916c4ba0bbb2c91408dd2f60b100/16016402543.pdfIn PDF document text
    • http://fittbike.hu/files/file/43000919401.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a9f2ece9d---77078271349.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/r8jgehu8s64hf1a0mkmd1v1kps/32954029463.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0f2ffd485000a338a94e3a6855b20b8d/pajorebozizifanekopakoset.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/zulesegijusizipowoxav.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cd6e6709c---fuwinobinipeluwukija.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c3df9e3c276---16710587636.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/luzorepusesubix.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/9651e134e583245b4cd72ab3690fb931/73827215102.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/pl8rblcv576vbk2s0n7jkiq7rk/zujutasidujipeb.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/fakajumiminizasitimed.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/37200746576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=startup+investment+proposal+templatePDF 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_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12357 10656 bytes
SHA-256: dcc2441fa064d921ec890f2cd305703550659d280c136ad0e925bf0110c6d633
font_02_sfnt_off00013bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB1 18384 bytes
SHA-256: be65d002e4926a59b8616413ab4eeca996cbf0e0ae6e478e170005c7ef6a0836