Malicious PDF — malware analysis report

Static analysis result for SHA-256 5327ed69f59ab741…

MALICIOUS

PDF

73.4 KB Created: 2021-09-15 06:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8dfd88a63d3403542e6a881eab37e839 SHA-1: dc4f6bb099b859a326913606d6e6eb8b455aae54 SHA-256: 5327ed69f59ab741d35cfbc46e325499d738f82eae0d0a66c0784bb378e9c48b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. This pattern suggests the PDF is likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=vidmate+original+site PDF link annotation
    • http://alltechsro.cz/files/sajut.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e39bd75a57a34b848e88096873c4deaf/10715155428.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fp423eiskirb3tgma9c4r9ok21/razemesajokax.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd36d082f---tatuxirekon.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/movasugej.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/14edff695af076e11f9328adc14dd6ef/55456053360.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161413b9ae1f65---93228061126.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/kasififogako.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/c0cb1oslddvehtu492rdm5cm3i/malufanabubuki.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414238710e7---82058426962.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/jifupavuzizitilijudifom.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/89305048123.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/85430466798.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/16666515734.pdfIn PDF document text
    • https://bor-diing.com/upload/files/18407587397.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/52591825671.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/42b2102b496ffe770d8b3d4425fe0b43/93537252149.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/22217150500.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/35565636118.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///pibamofuvo.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/12315652302.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210908163112392458.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/80130502308.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/q3186sjlsmobaj9d7p31qgmajg/lowasob.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/gedepolex.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_off0000bf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD716 16248 bytes
SHA-256: 2707f7db84ad8a5865da9177913b3429ae19faaaddd4207fdc33acc85af2937f
font_02_sfnt_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 10560 bytes
SHA-256: 397f6b4cb5dfd389c4d48cdeb37267e715733c62c88e4464bcac034f2af0ba72

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