Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdd276932d52d3d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 10:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58cf8bb84824d46ab7618f17a9e54b1e SHA-1: fc3c8f05e27bd7eb1fcbc568a12f6475ab0ef518 SHA-256: 7bdd276932d52d3d3a090a1df57bb17d75a7a2e40e9ce0782d8cb052243bf490
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by a machine learning classifier and ClamAV, specifically as a 'Pdf.Phishing.Trojan'. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate an attempt to exploit users through a phishing or malware distribution vector.

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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/42a37404b5b64271b61c6111c29dd233/59312238660.pdf In PDF document text
    • http://iccarrentals.com/files/file/datizodi.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/59885161091.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/fofelodokapufigusun.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/kadipewasegutefoxew.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f268126634---24362674614.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/knfj72ule8t0092f28vld58m24/39531033040.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6090a612d---xikojivusobibija.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b7e758521c6f5ee6b19b1a630866d961/75235651177.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/61362603274.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a54317b7d58---10605862909.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/befa75ee7c82e1af0a96b9c58ffaab62/99534828802.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/29b73e796261b4e2b1ebe98a7bdfed80/pefer.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8a1e2cf4ded5e4e997847052ebc80434/28408136539.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/xutetipisitudaxalise.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/ac2922ca182f4afe8310dfa59ee9ccf8/tutilixaza.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b4cff45958347a9c4e92a1cdb7ea3325/19107396432.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/fidobuvidefametojex.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b342560fa6d---59165589289.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/23875564125.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/50428885780.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nunidivevipegenawur.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/81659655245.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/35080697628.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ece1c889e---xinewinuvom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+rich+asianPDF 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_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 18104 bytes
SHA-256: b4a0bd0355989fdfff14bc5b90c98e970c7064e5f9f32b69ce72e3f73887e712
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 10024 bytes
SHA-256: 0b049ec5c86478f1b45c7629f76061cfdad72b27a3e621783d61eed35d9e2b1c
font_02_sfnt_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1