Malicious PDF — malware analysis report

Static analysis result for SHA-256 119a5bf00cad04b7…

MALICIOUS

PDF

91.1 KB Created: 2021-07-08 07:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16f4f4690c1fb641786fffe508bb28eb SHA-1: fe6d30300f144d8250de13ba717fe4c7c4208e02 SHA-256: 119a5bf00cad04b7630ae0d8d191bdb1f695ca16365230d4f726c5e3290819a0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://smidgel.ru/uplcv?utm_term=pronouns+he+she+it+they+we+you+worksheet
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b84ff1995528300fb9147c6bdbccbccf/24700770332.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d006u1f62i32kjfhmrfeouuss3/luvijotufuxekix.pdf
    • http://aceonlinementors.com/userfiles/file/30406841819.pdf
    • https://silverlabpupsforsale.com/userfiles/files/wuvodosek.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/cab78994ab0808920c81426e414dfce2/92251458509.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/286c19nskgc6q463vkdoop027b/73844273630.pdf
    • https://dodomacnosti.net/data/file/48389866026.pdf
    • http://ingenermarket.ru/userfiles/segekedal.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2kt5d8uh56obkc329bgcq1c1u2/nitexegug.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0358e654dfcd07799083934030548798/zejupikonapetuxot.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/bc3c5020d31ea6c8d596774bce3b60bc/pamidopanovenozilukas.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7a69634141c1accd9a9cc38d2b4978aa/37048638315.pdf
    • http://haki.vn/uploads/files/44993209120.pdf
    • http://www.findvoters.com/userfiles/file/kugukapadenemebevesevuja.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a9184a2dc3d---87327463213.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeec3e4fa7---doxizagenakibujumifejazoz.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/4phhp1f9q2ilf8mbltlq8li1e6/47097613677.pdf
    • http://sp3siemianowice.pl/userFiles/files/nutimifopa.pdf
    • http://llux.vn/uploads/files/39813052397.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c26191493---xizirejumodoloneke.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/65361433442.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/g87qv6gff27nnrvnnbjkmh5ivu/wulurufo.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e13b359d66310c0ceb66f72d7ed0c1da/2279851393.pdf
    • https://fobh.net/userfiles/files/kusurujadasitawevujizut.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/38462318324.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c449ee274ac---11839335515.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/1qk3aenar6np5c0jp36it5n006/janakujulujodolasoxij.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_off0001006e.bin
470e3ada27756e11acd76e08086b05bc72bb597f1c3b1297a1b1eabecab0bc67
pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 17864 bytes
font_01_sfnt_off00012efe.bin
e060cbe9c6ce521903def1b54bbf87e24e2494331dd648b9f3ea0349cb1f50f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFE 10388 bytes
font_02_sfnt_off00014695.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14695 16792 bytes