Malicious PDF — malware analysis report

Static analysis result for SHA-256 d648b4a2a58e3e25…

MALICIOUS

PDF

88.3 KB Created: 2021-09-02 15:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aee986fc1e989f2ec6b80fb128d2d548 SHA-1: 162958e2a3eba6dede6e9db919cdbb34dc1fc0e7 SHA-256: d648b4a2a58e3e25a78e9f6039f639413995c3c5ad8ac019baa7a58ef09dd417
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards an attempt to lure users to malicious sites, potentially as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://xn--b1akwe.xn--p1ai/userfiles/file/paporufi.pdf In PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/wogizefepurezite.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097a3e32c78f---domudebewegogozame.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/48981417629.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/1db50054a707eacb1c02ab137f6c71bf/79003869041.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c9ed2062---25038124199.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dkjqa2gjqjjovc7r2lece17aef/89121600943.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/vukikeziruves.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607399f800601---bibinigazi.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe58ee6ecf---52312098445.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210802211548.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51b8d1a2f---niwutoredudunuvot.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/46109791089.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/t4l1ourgm5p7noruq74q2d0dj2/wezag.pdfIn PDF document text
    • https://people11people.com/uploads/File/gakiripebimizixu.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/83658678344.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa11a59ab23---53894441733.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/buzitatudunov.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed57de99f4---jipixebizoputitiko.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/gagipikubebesolilelim.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/jesaw.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/9311cf253beb4cf0328f01617c0450ac/xejujumizovokejeranibaz.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/sejagi.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/82596003832.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/70671687931.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/tufijuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=endoscopic+ultrasound+pdfPDF 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_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 18448 bytes
SHA-256: 7a952f18843c1d8f48dcf870199a56e3ccfb52cd10248946cdfabd054159e8a7
font_02_sfnt_off00013afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFD 10564 bytes
SHA-256: 05fe05bf89542f0cb2c13fc99361ed90a4b642db24d713f4219bcbb938de7e36