Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e3149a6be0b078…

MALICIOUS

PDF

93.0 KB Created: 2021-09-08 01:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 935e243e715972c4e6ec9f29dd0ca917 SHA-1: 4984782583de39c59f5fcde121f04744c11b4e0b SHA-256: c4e3149a6be0b07828163ae1128e302a3c5a48beed9ebb34c1ec8180a9b2ee24
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host PDF files. These PDFs likely serve as lures to redirect users to malicious content, potentially for phishing or malware delivery. The use of compromised CMS upload storage and disposable hosting suggests an attempt to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://catamma.ru/uplcv?utm_term=honeywell+t6861+manual PDF link annotation
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e65834ebf---80515951443.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd5bd13d4---vujiloxerenolar.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad906b242c8---26309492134.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/t7hof4ob97vjpeoumaeqdett97/53411588854.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/ralajifesinedomi.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/kusanozimasemexobomuf.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/aa84d972f156bebc88fc8af105010e81/88251328882.pdfIn PDF document text
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/65599274607.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8b687d3f9---52835545635.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/6924336853.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/48740295198.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0462f309017a274c447759bb5a389923/bogijurabajeranikef.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/rozorewaketelanejuwagu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ac5e31fb---66478632824.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/dudegupopegeniraboz.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/wadovolat.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/58567186242.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/77683231109.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/5ifeqkqjimh6p070qtjvddi2v9/zirafojomi.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/vokufirowe.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_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5E 18244 bytes
SHA-256: 16c99edc19dc8d76771a8590e6ebce90a890961bdbd0c358400dab0a603fe4e5
font_02_sfnt_off00014e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E28 10628 bytes
SHA-256: 93eaab96f91c35465c3dc9748f2ad93427e7990cc5fd534b079da527aeff1f8b

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