Malicious PDF — malware analysis report

Static analysis result for SHA-256 641d5c0fd2e97cca…

MALICIOUS

PDF

97.7 KB Created: 2021-07-06 05:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 409858485a14c73c92224bcf81b4fd34 SHA-1: d210e52caa3342dfb905389693804c6d295f83dc SHA-256: 641d5c0fd2e97cca3aa99d8a733b4dc30b6c1966fd9fd310fac05d52032267f5
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The file's structure and numerous external links are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/6e3e259b98dbe113868c74bf9b7e836a/22925102868.pdf In PDF document text
    • http://malifer.hu/upload/file/24241678658.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bc952f37b7d43ea22d70fd1d94255353/pawabivare.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33017067130.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/558c8a6b9f94fc9f0fe5cc263d6e7957/woraxipovuxezatubipimupu.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/9fccdbb7db082f441cfe78f1a3279838/89504579118.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74db40a3d9---34435161058.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kibtp418a75u833v332j7n2qt4/4565588718.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/59hs0jtdisfiobuvch8qb3nu46/medimawut.pdfIn PDF document text
    • https://bauarch.bg/files/67377419917.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075743d63e6d---kigatopi.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/42418216858.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2441b453f---fevazinelitudizakaxekajev.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/d026tj3k2n3ofhjlhu5l4f12on/xepolugapugotivofajukes.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16076fbbf6463c---tesosovaxudedadikeveba.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4d06f96bd07e68a49d247070910cfe26/gozeguwujujaruf.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/2c152554509875937a36c7a615133640/32294916465.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f215378eda---88746439315.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/bepakomusazuwux.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/50421927626.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c02fa9e1cd9---69936395911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=david+bowie+baby+groupiesPDF link annotation
    • 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_off00011cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB6 17056 bytes
SHA-256: 8fa62ecb38ab1ca37fa47bf8596897153f1a3e07531aaf8b23235e168db40734
font_01_sfnt_off0001491f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16136 10824 bytes
SHA-256: 327b1f9d442ac9dec67a1f76d367441693c85b59722e6326d182f6c9f04c983b

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