Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d297d815c610fc…

MALICIOUS

PDF

84.9 KB Created: 2021-06-26 05:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5548a406a87a23582556b9b1d2e7505e SHA-1: a8705a7f051f7758c445cb46035469453df07f66 SHA-256: c7d297d815c610fc70c09d67b48a2c37361334c1d1abb0486d4180a7279d4fe6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment attack vector. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=montgomery+and+runger PDF link annotation
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3d3cbc8d8---5517220687.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5196754058---80239865817.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/zisabetimekuzorode.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/58tunlqi08hds7t25ek5ld6cmh/44700599279.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd482714fb---84887126362.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/3al2rjhsq5fsdq4rdkkmpd95ue/93744431992.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/41771065661.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/posujuradidopigumuretig.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00cc3c90b7---47496960339.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/tijaxinazazimetufuw.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/f9b9mpiiuf1apccrbkoia3c5g1/52963398803.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d21807912dc---45637183774.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/97b994470fd6fba2ca75fe56adfcb46b/puwelaluzijokidezori.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e748467301b4bc046ab03ed0fffe0bea/mijufebedor.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/9808f4e0eeecc1640853ea22b103e99b/28309505407.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/rofawizuw.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a72f30b2c59---tojapere.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/gefotegoxurawekolamubiv.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/b3669168bb10d358a02e09f4bd5edeed/33501075695.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb58fc728df---54247796317.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607965b7a8b1b---10068774295.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s33cja5u47lhes09mfs0gd44g5/vegebinozu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c912d9cbfed---vesux.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/bd9ddd3f4b180c29a144f843afb9da45/jawiwikonotobure.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/wabamudazibabizifo.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_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 10492 bytes
SHA-256: c2f5cbe52b4ce5cb47b7b752aaf15272f18748a6ee1c9305c72e149b20354618
font_01_sfnt_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 19172 bytes
SHA-256: 21fd9a971c6ac428bdcf13c6c64aaccf90b3476939fc8dc68ca8357f937bb8df
font_02_sfnt_off00012cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1