Malicious PDF — malware analysis report

Static analysis result for SHA-256 7196c2f969e70fa2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 20:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 462fcfdfc50a2f84f9cef0404a9f198b SHA-1: 9ea80411707c8ed906647ebeafcaa195df3d5002 SHA-256: 7196c2f969e70fa2f8c015fa87a16baeeb787ee5d5361c92d942e491a4eef103
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=classroom+bathroom+sign+out+sheet+pdf PDF link annotation
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/55174002633.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/jonolubilozuzevotedebomar.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080271e9fc24---pazupesojulumodazomaku.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/43364890369.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/amugunager.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/27301028810.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760503c3f8e---kovuvexomukuwopibe.pdfIn PDF document text
    • https://davaocarrental.com/images/file/5580678031.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d9779510012227bc0c46d0f4134e9edf/15435042608.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/38411691077.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/lusavozewedok.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/leberujuwokubofupipufamag.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/800c83bfc24ff1ed2e04f6a81f7dd041/fimakiramaro.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ua88bf0ekh78ns0l5gmss93fd4/90389399249.pdfIn PDF document text
    • https://tmtteks.com/files/fixijakamazivenalowad.pdfIn PDF document text
    • http://askaudit.ru/price/98886687578.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/nupuredipivapulireno.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5b95cf832---19748837024.pdfIn PDF document text
    • https://renetravel.ro/images/files/bexojawevivewati.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/cd4eec49cb915b580403ce394201e066/topixovofubobabazudij.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/jebekufogafodozulelaku.pdfIn PDF document text
    • http://allycatering.com/userfiles/bupiwurebep.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_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 17680 bytes
SHA-256: c14e432c940e1622a6e3f17b78d99cdd55bb0fbbea07bd1c26d5e0a782f8d940
font_01_sfnt_off000106a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 11216 bytes
SHA-256: 2327985da16abcfa828f31a42c80bc50eecba712dd5853a73e23326bac03f388
font_02_sfnt_off0001204d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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