Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f7a5fb54f4f2f2…

MALICIOUS

PDF

78.0 KB Created: 2021-06-25 16:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 164452e791f54e646a7bbce7c43ee193 SHA-1: 15761c64c42686c983fa10a26150c6126ce6dfff SHA-256: b5f7a5fb54f4f2f269cf909c47bb2666f71db666577716271d9231290c5ac784
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the document is intended to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crewmak.ru/uplcv?utm_term=video+star+pc+free+download
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acd634d2b1---56574716131.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed9a7297b3---runagedib.pdf
    • https://zlatartopalovic.rs//files/retitunurivoden.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/i57ifdufgason9f5q3ulrj3ju4/kiminozafixasopavek.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/5ceblrp60cmic1vrp2un4ttuho/kedeb.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607048f812cf9---xomudunavumidadizetizuk.pdf
    • https://condominiobrisasdelnorte.com/userfiles/file/jomuzuxetukal.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/0f1942fe766aecee4d1cf3d16e4c9325/zukovidupexesuz.pdf
    • http://strahovka66.ru/userfiles/file/77301604497.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9e739a7c999cb792e8dc6a3bb94b1f8d/5109175964.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c560f9df5ea---21076012896.pdf
    • http://supermarketdv.ru/files/file/63437664119.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607600874dffb---munutoxugibekatafukebegi.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c3706bfcb---89740193357.pdf
    • https://alihuata.com/userfiles/file/ruzomadoge.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2a131e6551ec24bdb88741142f07b3fb/valek.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAB 16792 bytes
font_01_sfnt_off0000e7c2.bin
40ed61b12cc8975d81003fc49022821d0b3b0b7c4905bec3ed4cb1d2a15f8c6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C2 10668 bytes
font_02_sfnt_off00010063.bin
9439bfeb959079f133d576335a17312b75b1c410406030530a72b045712c708c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 16608 bytes

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