Malicious PDF — malware analysis report

Static analysis result for SHA-256 145e60d9313d40da…

MALICIOUS

PDF

99.6 KB Created: 2021-08-08 20:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e161767322cad13859bfeea992bbb50 SHA-1: a2ee86b4bc7184007de5f03b8fdd417060a342c8 SHA-256: 145e60d9313d40da3b6c66e921a73ff45ab9fce4795ab7bd0b718480b754e6ce
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting. The primary goal appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cornerstonelaw.eu/userfiles//file/60779931018.pdf In PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160734224a6905---99136569541.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/83462658134.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13aea009d---95879910640.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ca919f9e46ca63d24def8017aa03e7e1/58852656546.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/raxareraforabuteti.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25425009648.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/gilawurukuberaxuma.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/18cbfbe2823748db34b61246b7c7c109/jinoboxusosi.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/wizigizorur.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/dujupejidopu.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/61647230327.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608624afd59a4---terisokadokanefigefi.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/miwilelunogonuzix.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/28156108753.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/88770772469.pdfIn PDF document text
    • http://c-amc.com/upload/files/roxalelujemiribuzi.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-17/20210617202947175007.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/fekojizapotiwapavi.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9817be6e941def90f1efa0d3ef3334a7/39998600815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=single+phase+full+wave+controlled+rectifier+with+rl+load+waveformsPDF 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_off00011968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11968 11396 bytes
SHA-256: 768a2ebef9d439a58301f6a737566186c0fabc5690c64ee4450da19a3960659d
font_01_sfnt_off000133e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E9 19336 bytes
SHA-256: a5303122d01ca9bc9f9e2bd2273cc6b17d9cc0e7734ae17647c9002e489919ca
font_02_sfnt_off00016856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1