Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d8c4df806fa00d…

MALICIOUS

PDF

87.9 KB Created: 2021-08-13 06:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b492f1857716731d490ec59158bf8712 SHA-1: 3f64c8d174062de43ccbc4b7c3b46a088b55a57e SHA-256: e7d8c4df806fa00d498ae2f747d924412e8d9e9185ac5a01be975032fdc89f71
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards a tactic of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=camera+control+pro+2+serial+mac PDF link annotation
    • http://katachizu.com/img/news/files/muxonubozuwepukawabul.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/19792291266.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/gimopikixora.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/86783755549.pdfIn PDF document text
    • https://thepainter.asia/upload/files/58021833008.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9821fd076c---30900129841.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/34828544828.pdfIn PDF document text
    • http://findacommodity.com/upload/file/retagalugajomelebokogoges.pdfIn PDF document text
    • http://malifer.hu/upload/file/97747144719.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/30498511408.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1c33d8ad---wetogerazijinanamariles.pdfIn PDF document text
    • http://berbun.com/user_img/file/fenavi.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/v4u164p2bholiqa9m3r14dfn9v/10129974487.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/m68hv29de0l3i0nus0rp0o27ke/dupototezubudilab.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/31725121340.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/bikuderivagitipavoderidu.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/kesowewalagadepoxakunuda.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9e4ieqa5erfv2nm8pigrchla8v/30806134423.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16106aa0918109---fefakulemisafawisukaka.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/470b8e1f679d5b465c125c51d0285459/pamize.pdfIn PDF document text
    • http://nnhs1964.com/clients/a/a2/a2d7b74ded15306de89ee4bbe2f7ed3f/File/15683579649.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e4169dbb190e1dc9e03d54ee06c982f3/38824377701.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da07d89b7c---15477420223.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde6f03f041---buzeke.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/hn1qu5e4nj4mli399g3ua6fbqu/rubojasog.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_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 10688 bytes
SHA-256: 1a4a307fcb67842c1b0feb252ccf6eb3ab95f8032378d38e94724f7d242cea5d
font_01_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 18520 bytes
SHA-256: 0a3d7a92af5db0c6a606ca9b3823364cf73d1ef5e6668fc879617f1bb19ede2f
font_02_sfnt_off00013915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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