Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f92fa7eb621848…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 03:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e54fc20490b6b6ace1975b25ee08cacc SHA-1: 9f0c00323fdc53bcb1444ae07ad62999de1164b2 SHA-256: c1f92fa7eb6218482037c9ce4da021f90af3b2a44d25157b59b181ec46199ee1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=black+and+blue+123movies PDF link annotation
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa420530e2---53137890736.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/60341972395.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/romamop.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/guvugam.pdfIn PDF document text
    • http://malifer.hu/upload/file/nufedixed.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/tenunazipu.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/73137826645.pdfIn PDF document text
    • http://alkanboya.com/files/file///45032931127.pdfIn PDF document text
    • http://freeorden.com/media/file/87941904054.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/82044262149.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613daa2cd8a16---futazovi.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/zuxisatubegalinasojevota.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/xoxex.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/kokasomivoxoruvop.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/rikirufavipima.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/togujixoniwawadamexux.pdfIn PDF document text
    • http://qdjshg.com/files/file/kagikubonu.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/19101004432.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/2322564093.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614629d67e5d1---81456626991.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/20124742917.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/38994122737.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB84 11128 bytes
SHA-256: 9ee6ef564431bba6e4c3713527afdbf3d0b39f110bf20ba33711f11274f55a94
font_02_sfnt_off0000e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 17976 bytes
SHA-256: e06ecf3fb25501827e281182ad8dd9f49b46f981bfcd32030f0edf8322796bc5