Malicious PDF — malware analysis report

Static analysis result for SHA-256 260675e977c61b08…

MALICIOUS

PDF

87.5 KB Created: 2021-09-15 17:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6c480ff1c99cdbdc85c5fce8cd3d9ea SHA-1: 1af6eae5ce6f564e1603465ac3b092f325b43748 SHA-256: 260675e977c61b082ac7b2c4262b1d650086aa0fd3a2a155f3c3ad756566fb3e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e76fddaff---86526892806.pdf, are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://duz-drustvo.si/uporabnik/file/99639275348.pdf In PDF document text
    • http://chinhsuasolieu.com/media/files/dedikorafojab.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/95535195847.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363ac436054---15361367447.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/43340073620.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e76fddaff---86526892806.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/mugawakelusomutujosas.pdfIn PDF document text
    • http://alcantara.cz/data/file/zakiz.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210903072757.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/kelawiviju.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/6873460910.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f82becc31a---70591382088.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/18028394747.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/finasitigedanexujun.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/57114292639.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109111000472205.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/sutejonojulalod.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/63091807024.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/gedibidirojiberevob.pdfIn PDF document text
    • https://gulamanis.com/contents/files/dulibenukujow.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde727e8dd---95409008536.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/siwirazejoti.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/76913943481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=five+nights+at+freddy%27s+latest+versionPDF 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_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 10824 bytes
SHA-256: 49bcb3c963b1d757a204b155173fcbe65e344a66d732460371c88220a1121c65
font_02_sfnt_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 18652 bytes
SHA-256: e1fceed2fa5b86a074063334a3442ffc0bb0d8db8fea702fc91cc69609346e9e

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