Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec46c9d6b9c0722…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 16:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e23904a7bf8a752a511a05839de47d0 SHA-1: 76c4d78fb24c58994aaa995bdb433bfa44f24126 SHA-256: 8ec46c9d6b9c0722e6a7929f35b90c6cb8da198e9f69bca7b850f23de52311ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories, and exhibits characteristics of a link farm designed to obscure the ultimate destination. The presence of a visual download button lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=bd+chaurasia+pdf+download PDF link annotation
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/13572987268.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/85f3cbb62a16207c7955b99f8652ed45/17100791685.pdfIn PDF document text
    • http://ranchobg.com/img/file/mokefamomudinademizov.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ed2098e104560869f09e790fa38c6f6f/45295393701.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/46108034079.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/ruxeveg.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/28251953769.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/10811356606.pdfIn PDF document text
    • http://www.siposferenc.hu/html/bilaz.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/jipewekuxufawewop.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/tipubipibopuvixa.pdfIn PDF document text
    • http://elitacasa.it/images/file/66175370570.pdfIn PDF document text
    • http://tavio.su/files/file/vimowufagetukir.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/talup.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/40642231995.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/82882238320.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/mowidu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8746806e---43673262764.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/larivajewosibovatutopi.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/55975697853.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/pubesenebid.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/56440243123.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/pijajodigawutoxafiralom.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/tapiriduped.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_off0000cd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5D 17232 bytes
SHA-256: 380b8a90280e3146b5d7d874b7e00ce4f41f82e35d3991e881439ce996d9d91f
font_01_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 10724 bytes
SHA-256: f9c3d8634145f9a8f01ef63b9e9d83c470eee2692cf6b6b2d78cae5aa0307c99
font_02_sfnt_off000112cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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