Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7befd8b6db8f6f…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 12:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7936f410744d003d6b8da3cf0359e967 SHA-1: 1d28c4cde12ca28b66371434a728888e13d8e3a4 SHA-256: fa7befd8b6db8f6f6f920f0536ad5dd2f5a444931a95359d27096b90217156f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm, directing users to compromised websites and potentially disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bd1e04801---vanojujoxijusagezoxetojot.pdf In PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/19645304368.pdfIn PDF document text
    • http://short-story.ru/upload/file/vutigofejip.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/lawunoramomima.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/xabusu.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/ip9dfpseht4hchc9ejd02bs037/68033282641.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93e041211a---fadadabevowulofapewu.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/xezivijetizo.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/powov.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e6f39733b---kikiwi.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/fd76e76d66c5ug6c6dlap06cq9/daderekanorazaxidobebevun.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/33377386591.pdfIn PDF document text
    • http://orthopediedelft.eu/files/lapewowokorijanazokij.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/takafut.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/17477020886.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/mizutafejupasovabijid.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/zotof.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805a5615bf2---6902700811.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/57ddfe83f9fe7504677e5dfe46382eb2/76188967477.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/jotoduz.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/gesinurinivolekaporovuse.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/35233317761.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d8b34bef673316f891412afaec66fc57/vezajepukokekadexe.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/juxababowisulatorut.pdfIn PDF document text
    • http://fructusartis.com/i/File/12244938829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=civil+engineering+notes+for+competitive+examsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 20732 bytes
SHA-256: cd67fc3cd334ecd7449f0e28e70f951e088fa2cec225723671d975fd8cdaeb00
font_02_sfnt_off0001291f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291F 11020 bytes
SHA-256: ff92d1ce53b9bcd8ed1a33a835a886a990ce235f6511674b0a3aca59a19ded39

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