Malicious PDF — malware analysis report

Static analysis result for SHA-256 de195ca118cc773e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-02 12:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a75b81a4868826a1071c527da60b17de SHA-1: a6f139fdcf961a4e0187c395d4c1d28485747cdf SHA-256: de195ca118cc773e3ffd143c3910955106b50615111dd2f61472e29c33c53a9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple potentially compromised or malicious websites, including those hosted on compromised WordPress uploads. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/9c98138255ec1f39867d3c91fa6a097b/xizakepowisibeniworum.pdf In PDF document text
    • http://thedewakohchang.com/image/upload/File/4584483810.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/il78dvkit7qmb02oq3m2r0b8k3/xufefukizunonodavilit.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/66561300068.pdfIn PDF document text
    • http://alkanboya.com/files/file///2866382836.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/70678598825.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d5581443d---49386892013.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/a728c6bd02e1a6311005c57e46d128da/fedopat.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ckujpm4a47hiov0f77guo6gv09/tazex.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/38187268889.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28d497fe5c---8893974922.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tazawudegodukexadex.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/bugupigosuliju.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/30996456137.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/61043364996.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4baf35b387---kirudilimul.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/doduvejowopukuxure.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/voperejojuxukoj.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7c5109b82---zudawi.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16082a552666d8---60848433030.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/zenila.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7f4b2233e---85325928736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+john+deere+lawn+tractor+repair+manualsPDF 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_off0000bc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3F 11072 bytes
SHA-256: b8351f289d22f997fdbc36e3d5f2c59f9278085f3af497af5150c3dd2b761e6b
font_01_sfnt_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 15752 bytes
SHA-256: 14ee80794dc0bf93c2103bc9d9d394c59300a67fd8402082ecc6e6966d22b875
font_02_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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