Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b38bbed854af1db…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 02:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d05eeb703f2f7ed59b5b9a3180c4bdf5 SHA-1: 70f8a1cd04bebc5d7170b1db03581e156a9ebf86 SHA-256: 8b38bbed854af1db4856f9f8688a9eebd75d33a4df6895004bc538b3db488238
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to compromised CMS upload storage and disposable hosting. These links are likely designed to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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=antecedents+and+consequences+of+employee+engagement+pdf PDF link annotation
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f65eae5c0e9---47728197168.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/tadef.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a83d198efbd082c813695c3d7b92b627/86806333133.pdfIn PDF document text
    • https://lapakunited.com/contents//files/18073240270.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f5c53b832---63638669697.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b46b4d0c2bd---xuripudezomusug.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-5/20210605085455305919.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd692fddfac---21251155993.pdfIn PDF document text
    • http://yulintimber.cn/d/files/menodivigo.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/18215613487.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073f49933ab7---piluwarodit.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/tavagok.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/gakafuripesag.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607246b7ded7e---67760584563.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d88d40320---74341671504.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8f5c5c1d5f9accad07e93b957ae6fb9b/60793975014.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/xanovobajejigewofedi.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210623_DB480E656DD06E98.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff4d8ea13---72328999489.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/78379289116.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/42855961689.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa2584aa344---tisonukewupebupuzugomi.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/jirujirit.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_off0000cf96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 17384 bytes
SHA-256: 7c2402e9e5d0ad712e9c4e715ddd43bd83b91c4f3c2a345d451471a01f622f38
font_02_sfnt_off0001147c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147C 11112 bytes
SHA-256: c0708923d52e7b4efd159eb2b213ce5a8d43a8b2c3ccbdc307259ba8b1ab9ccc

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