Malicious PDF — malware analysis report

Static analysis result for SHA-256 2450f78382ae78b9…

MALICIOUS

PDF

71.0 KB Created: 2021-09-02 20:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2c22e7b0ea587ef5db8f29030cf7a0b8 SHA-1: 19a870e3f8e142bbffb66dade943b90af053c539 SHA-256: 2450f78382ae78b97e67b16f7c8ebd1cb6155e62a74ab067a8b63376ef235e24
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/rdps0ofmprm3epgm2ohaa1eoo0/64682023816.pdf In PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b74375137bb---bolanebanizazuxi.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/gugefatagezakevapu.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/41136f12dbbc0fc2f2be193b370d831e/dupijivazamasotex.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d22f728de---xulifaredukenifove.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/pofowijalemabetonazuji.pdfIn PDF document text
    • https://aspirans.com/files/file/35451225615.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/69743207572.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/28936106895.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b38071dead---rudabinukegipotidifinupe.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b1a22b34e---rimikevoridabiligijeguf.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/lelazi.pdfIn PDF document text
    • http://abnicum.com/files/file/45283505735.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/lewozumepuwepererigibe.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/99c4e6ab62e3a15bba8f38055a106892/85036126335.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/a8rf17ucc0o3ec3pnal1el359j/mabofigatoxurixajabore.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/15278013825.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5302813556---53152782942.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/88940442407.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072af23cc2b3---famalekiwijotudijawozo.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/18417319738.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a237d29ec1---fijiparovulotigawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=harper+biochemistry+book+pdf+downloadPDF 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_off0000b3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D7 11308 bytes
SHA-256: 0429f6fbc215ed658135d26e03a51cc06c0d512f4c9c18c51c75ae3889b7543c
font_01_sfnt_off0000ce10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 16032 bytes
SHA-256: 85eea53ada617de49edc57956ee5c714a1031873859de7e2a65b991323ec14ff

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