Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f44d7757a94a8f…

MALICIOUS

PDF

91.7 KB Created: 2021-07-03 20:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaa60d0adaedd294bde183127e4a3e6a SHA-1: f29a2662d976f4f27708ec7341cfdf6835af8c89 SHA-256: a1f44d7757a94a8f65e0656945ab7cc64d4e0e723f6ab14e4ddb069391d616f9
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of multiple links to potentially malicious content indicates a high likelihood of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7dde58df5---14394795588.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ehtvhgg6foc5ags6fca04r2p1u/47767912173.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/430ucte55s6r4f2njidvmsjnt6/liravadabasav.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c52220a98b---91590332678.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/49099134540.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/77749786047.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3ba46c3dffecc30baed03cbab9de47a6/goniwevafeduvexogijuzoz.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ea599rktgc3chqp7e0988t57to/13435122955.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/4edfe662de1b7739d3686ac238c7a208/tagagomapimepavovesu.pdf
    • http://superplasticizer.cn/d/files/dizuka.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/319503a639b004bae79a59454afba319/widuketigimilariwo.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1eea70e73dd699fc4337406a7cf45603/24109914188.pdf
    • https://grupo-kayros.com/userfiles/file/16141763770.pdf
    • http://doks-films.com/pcms/content/file/52947953719.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d32a8740206---xasexuxunugafolodevuve.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c65072e65e---gifidotonolizudavav.pdf
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/xujotelod.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/24750377840.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/qgrsthb2gt2ko5ma5tpuv9m824/14447879945.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/90064150791.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=othello+questions+and+answers+for+class+11
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1580becfd---desar.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_off000101ba.bin
512646451b6e2251063cd18a7c89ac02b2be06560aa2d3d161813a9353ce3a52
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 17692 bytes
font_01_sfnt_off00012fdc.bin
87b0d344f3220d9f9c47209a7350938f5af6fba8ae9e5b28d158091f66311105
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDC 10984 bytes
font_02_sfnt_off00014942.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14942 16792 bytes