Malicious PDF — malware analysis report

Static analysis result for SHA-256 5590be24b89a634c…

MALICIOUS

PDF

79.0 KB Created: 2021-10-16 20:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d0aa59c4457ea84506278d32ff5d1f8 SHA-1: 7bdf1570df50799d31c4b77f69cbec1f17bb3d80 SHA-256: 5590be24b89a634c274e3b1dae5de9f97f2d601d4a3185798c1aab5525de1193
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and disposable hosting. While no scripts were explicitly extracted, the nature of the links suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/g64jte7ffsm6rar1sc9gekccj5/66445925453.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/6uvo95qjip3abkad80j0k839h2/relabe.pdf
    • http://jfac.kr/ckfinder/userfiles/files/xixotafezogi.pdf
    • http://tipsclubcr.com/campannas/file/69124195361.pdf
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/gazifeso.pdf
    • https://llibreriaha.com/img/events/file/bumeguravenajikig.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/57e93a6d1f87ca07fc391ad151c4fc20/ziwudirebisuzexudog.pdf
    • https://siahotel.com/userfiles/files/15161183236.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/wekaragefubizinow.pdf
    • https://palet-school.com/files/files/fenuno.pdf
    • https://performanshost.com/calisma2/files/uploads/zebofudikadipaxakivoviri.pdf
    • http://dfanchem.com/upload/files/12139576140.pdf
    • http://connectcontrol.net/files/userfiles/files/lepojuzevudutoxo.pdf
    • http://namuvaldymas.lt/userfiles/file/8125912545.pdf
    • https://facades-et-traditions.com/actualites/file/89566711552.pdf
    • http://szjg.hu/images/file/34418719488.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d26f3eecf48b751d01f7c88961e00267/26126931433.pdf
    • https://phm.vn/upload/files/49752157300.pdf
    • http://tiendanatacion.com/noticias/files/13822074624.pdf
    • http://salkim.com/userfiles/file/vinizolusoz.pdf
    • https://mmoxx.mn/userfiles/files/wotatubojenixeduretumug.pdf
    • http://yurisolomko.com/userfiles/file/rolovowonodidodazugosagej.pdf
    • http://gamebonda.com/ckupload/files/peguvilixejebumibojimixop.pdf
    • http://yoga-privates.com/yoga-privates/file/86352151654.pdf
    • http://devveb.net/userfiles/file/87239083562.pdf
    • https://feedproxy.google.com/~r/Gsjc/~3/7xhmvLXWVJc/uplcv?utm_term=types+of+constitution+written+and+unwritten
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1be.bin
1930b0855ec1ef506b7333614faeff9b95fff09bce6ef5b019ecf21c3da3e06a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BE 17140 bytes
font_01_sfnt_off0000fce1.bin
39bd5edb89415ac3cd298cd05091dfb056498cd44d4754046ca96ad7db5de00c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE1 10832 bytes
font_02_sfnt_off00011626.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11626 16792 bytes