Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d671764b4fbed8…

MALICIOUS

PDF

79.5 KB Created: 2021-09-02 18:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7cac4fcef39f4d748cecb0ac9b4e6837 SHA-1: 5af77f89755a652218369e6c2f794fe6afca7e3f SHA-256: c1d671764b4fbed8d7ee878a3daeba89ac4e1c435b32ca586c5c557f601270ce
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to domains that appear to be compromised or disposable hosting. The document's structure and the nature of the URLs suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://coretry.ru/uplcv?utm_term=apa+referencing+style+pdf PDF link annotation
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/7f2ca017cdd29ea4611cad222e8d9866/18592254816.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/vamowu.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/palewikad.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/bovatevavoxurip.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/99617524737.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/gugasokik.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/6853219320.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/83715152058.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/48505600529.pdfIn PDF document text
    • http://vtaky.sk/media/file/defepabilaruseved.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160964c63a5e96---35294894506.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608467987d11a---kofolutikotuz.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/dofokuxivi.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a525e07e999---madax.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/sowiwuwugobegefirozo.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c44a6a3eb1c61606fbf7b0da76b7693c/dowulavuborarevedatowemuj.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611639069ac02---jaronefudewetezu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ebome4nieo5h2c5q21t2i1bh9t/mudinenusoxabadezebov.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afc1b6c7e1c---8857377055.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/12374242718.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b360e824a3b---jumozogimuno.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/69107386177.pdfIn PDF document text
    • https://primer-spb.ru/files/files/tobulumawunapeserajofewiw.pdfIn PDF document text
    • http://synfarm.com/upload/files/46423748644.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/oqdplkd0nnn86ruolnpt2erlju/xilinu.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca76eba5f---43323943831.pdfIn PDF document text
    • 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_off0000d101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 18016 bytes
SHA-256: a10e7bd1d33fc738f83ba78131696bb7b07bcb4f372e418a08582ef42c1a02bc
font_02_sfnt_off000117c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 10768 bytes
SHA-256: 707ab076c8eb14bb97dc586a17f672ad8a188b05f42de4ad579ea8c3f875bf0b

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