Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f220ebb81ad8e1…

MALICIOUS

PDF

73.6 KB Created: 2021-09-18 11:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4442c146197215f6009120abd7807b79 SHA-1: ee9d844b117e6cdbef88c2f866d3d8d814239064 SHA-256: 13f220ebb81ad8e1a39c5bbe5a9f9cd63be90121ae13d52ebd7748efd6d5e001
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=simcity+mod+apk+ios PDF link annotation
    • http://www.fdconsult.qa/public/uploads/cms_files/jidutaseradogesowa.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/sibuw.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132b80ded1bc---vepibebuzilaxexagowitudu.pdfIn PDF document text
    • https://people11people.com/uploads/File/jigoderejod.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614366741aaf7---91713992147.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/ganamunirufegavoxovunipa.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/ripexolebugizeji.pdfIn PDF document text
    • http://bdsductri.com/upload/files/penelowulunuwolezewoxub.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/61573595411.pdfIn PDF document text
    • http://prestopc.it/upload/file/87050209447.pdfIn PDF document text
    • https://jotelek.hu/files/file/tudusixolubikef.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a44992a9355d4653fa89b3b84f745468/31237985858.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/lolawuzumadat.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/793559b401c9f7c6f0f01518a1eb4ee5/60616769718.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/39009645227.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad57b2b602---safebiwowura.pdfIn PDF document text
    • https://suncables.co/images/file/dudevukexinigabo.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/fetejik.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/sobavanakaduma.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/xabenuwurolibamosurila.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/wedubago.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-16/20210916123859828675.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ldm6hq2cot3sfhouaolf9d0pul/vibowawumeputikafutavora.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_off0000bcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 16936 bytes
SHA-256: b1ad96625ea02785ab702b4e396e6a37d99ef7af4acf6c52de20751c5efba7e0
font_02_sfnt_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 10576 bytes
SHA-256: a70a51feb0010d3f32f27dd6830165eea4256dd56fec6ace705001436eb4359c

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