Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c814ba1eb88cc2…

MALICIOUS

PDF

88.4 KB Created: 2021-07-25 18:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd87071cb77154846d38dbe562b2ef37 SHA-1: df332bddb7ce185c859125ea447d9e41d929ce5c SHA-256: b6c814ba1eb88cc2669a2084389ad83c188529f673a533d036f9aa7fad2cc5d2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of links, many pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'cmdv6gt6v6m/tijizexafokasagu.pdf' within a URL suggests a potential command execution or obfuscation technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0e89cd55---vakuxegilubo.pdf
    • http://baraanduliaptti.org/userfiles/file/xekojunojipaxisavedovag.pdf
    • http://radio6deenero.com/uploaded/files/xevenetuputogiwetat.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b453d4769ce---juxonafirizunuwoman.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160deec5c7fbee---24270258233.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/j2hfl4d2jfir9s6cmdv6gt6v6m/tijizexafokasagu.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607367f74096d---19204459384.pdf
    • http://accessprecision.com/userfiles/file/17282419486.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ebfvt0niacb65rpig59vfjgiq1/nifefuzisokikopo.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e24add734---61623387428.pdf
    • http://harekatmemuru.com/images/Media/files/zurujavujixoridojo.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/f54b79a449e68e995ff583034bd3d6bc/56545286615.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cee3ebb218a---mobebezovevetotuxal.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/165a06b9930a77619f19fa759260d8d5/zutezeme.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/f7692e9a64c93a56f34221c044426a50/5987175990.pdf
    • http://geteffective.biz/uploadfiles/file/mikokurodudavafizovubix.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a926cacc0b---10432444840.pdf
    • https://meganimal.pt/site/upload/file/newubujinowevu.pdf
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/20690032993.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/abd0f6fe03dc8c1c5704f0c76bfbcd2b/lekotakasivubafol.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772b7484d49---sapafajatesakasofavup.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f942e812d88---rubowarima.pdf
    • https://agrilaui.com/userfiles/file/69063415066.pdf
    • http://portableandcool.com/files/files/xutakusilipa.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825f5c83c28---dakoko.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a9988ef9---midem.pdf
    • https://www.ayersworthglen
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=difference+between+network+and+networking
    • 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_off0000f57a.bin
609eb29e1c7bbe6c3d1fd7dac150e4596a25e6dab17ef0d0b9214fd3e75129de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 17292 bytes
font_01_sfnt_off00012240.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 16792 bytes
font_02_sfnt_off00013a57.bin
61d4b823e2928a7d563443087686ba1d31fdd83a6c6626430a0c5b22deb4a25e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A57 10756 bytes

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