Malicious PDF — malware analysis report

Static analysis result for SHA-256 49beaf8a432b3ee5…

MALICIOUS

PDF

84.5 KB Created: 2021-06-29 23:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e91d66fd2449124ecb97a64403e579c SHA-1: 3edb9503dd7f972f547d01fbcba27a862e3a048d SHA-256: 49beaf8a432b3ee597f8964fe0ed43eee3b02d253bd9312d84551904431764b2
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to PDF files hosted on compromised CMS uploads, such as WordPress sites. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/bi0iq5ej5ndp1kd7puuck9nt6f/debolexedolololewefakemok.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a467314bd73---44871492620.pdf
    • https://senhewood.com/d/files/10320007769.pdf
    • http://altelaw.com/uploads/image/file/19208910650.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/aafb6cf987a17d24c957663d3a6a076d/87590273473.pdf
    • http://shadesvalleymounties1969.com/clients/868959/File/2023338748.pdf
    • http://akcjonariusz.com/UserFiles/file/mubojexixe.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed902d0e71---42402117361.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1608a67bda8321---koselobotek.pdf
    • http://syuncyoku.jp/upload/file/ziraves.pdf
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/dinaniperuvukonukonenibi.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769d8cc269d---25699230756.pdf
    • http://mid-europe-ex.com/images/blog//file/sujufixulapu.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hjeur95fhvbpnein2j3folcjhl/34773473196.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a39bb80c5c0---sirejugidal.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ffa3ca0dd8139c0a7299f4b143aecabc/77693947562.pdf
    • http://bilmatbasim.com/userfiles/file/kifozavazadiw.pdf
    • https://oklogistic.lv/upload/file/supojatisugimiga.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3829cf1890---fuberugogufesuwof.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dff4854db---lufaxutisepeweridukurukeb.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/qsuaa8vh5bebbpojst75rnkpfb/47566031343.pdf
    • https://o-dance.com/upload/files/wunugatozugad.pdf
    • http://aggengr.com/uploads/CMS/file/62472424520.pdf
    • http://historia-bfured.hu/userfiles/file/65272467088.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/sn6r3ko1foakqfee660a8jrjv2/zaperiwajovarejojorovomek.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=stretching+exercises+to+get+taller
    • 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_off0000ea81.bin
fa506e18f3f59435a06ac34d59778963cdeb917173b9f0ed90d73b9d95a9086a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 10688 bytes
font_01_sfnt_off000102f6.bin
05477f7e61682f3e5cc242df180eed5dffa0e738a93b9965f38a6b9ad721cda7
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 16188 bytes
font_02_sfnt_off00012ccc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCC 16792 bytes