Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e6284a1e15d2451…

MALICIOUS

PDF

83.3 KB Created: 2021-08-18 01:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aea4c16edc47bd4f56791b41a87543a0 SHA-1: c3fbbc2fcba2f1c79391b259c6cd066f32e79940 SHA-256: 1e6284a1e15d245178f2c598659e3a7af329ad702b52e9b17cf171240176b222
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to various domains, many of which appear to be associated with compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=el+hombre+ahogado+mas+hermoso+del+mundo+resumen
    • http://usaoxin.com/userfiles/2021-6/file/wakuzidanamanemekawivir.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881edda5b59---gowurapul.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a650d3d8f---83637740662.pdf
    • http://ebd.su/UFD/7623/files/xoxisifib.pdf
    • http://hitecds.com/userfiles/file/fakiwejomikafi.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/9v4uad4lqm65lfpcjcqhpbor13/vavebozik.pdf
    • https://t2sc.me/userfiles/93413754663.pdf
    • http://angarakshaksecurity.com/userfiles/file/4056727278.pdf
    • http://asude.istanbul/ck_images/files/59036781748.pdf
    • https://buka.ru/sadm_files/tidaxolanipakutenijifugub.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160781ab430a63---fukibemegi.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a499f14637a---92265230401.pdf
    • http://air-con.ru/upload/files/zapirikizisozoluv.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb8d3f25a8---sapozinoji.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607198e02de40---80106498264.pdf
    • http://eltprof.ru/userfiles/file/75014688472.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/6b3ugfh3tkvej1q5hic2lr0bg6/69472394073.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/tpf40aflr8k2t1qmp702nuerr2/sebupipamivudoxon.pdf
    • http://diodelumi.com/ckfinder/userfiles/files/14734815954.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jr1iqkjqciharfdft6mch3203d/5243995075.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075a72c60082---juxitas.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16238764133069.pdf
    • http://phrabat.net/UserFiles/File/23500379177.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcdf50d4de---88467351166.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_off0000e0b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 16792 bytes
font_01_sfnt_off0000f8cf.bin
213514d4a72a77030c8d0b44908ff9f8ad0213474c1da2c9b51e6b45a48d8d6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 10728 bytes
font_02_sfnt_off000110f9.bin
2cd1318093cbd1e9ada44d08c35075fc3bf554a9e5652418544db0f067760abe
pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 17604 bytes