Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b674ff09fa5ce8…

MALICIOUS

PDF

75.4 KB Created: 2021-08-14 14:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6672a45af8045d8a17092d235f87f0ad SHA-1: 1c55f832338582777c990e215ed2f808a08ceeb8 SHA-256: 44b674ff09fa5ce8622255f747cadb38686aba0a550391bfb67a2a7c41483086
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to manipulate search engine results, likely to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=selected+topics+in+inorganic+chemistry+by+malik+pdf+download PDF link annotation
    • http://anhuizpyy.com/upload_fck/file/2021-5-31/20210531003700919986.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/bilukomadiluzij.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6d5822f31d62de5aca9c99e3cd7b9b9b/91940412075.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/87912532656.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608372eb64cf7---99841632524.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/31018914037.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/41156459157.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/giniv.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/fewovawamemoxoxofajepufov.pdfIn PDF document text
    • http://andrewclaymonfishing.com/clients/a/a7/a7b0d980ee28df7184f998a87a00dbd5/File/wanumijawarimuxevuworevo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c636370ea61---63633860673.pdfIn PDF document text
    • https://tavio.ru/files/file/wulupemopuleremonupabi.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81afe040bd---81424233623.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88fa27426---gununiri.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/76777072155.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/gatoletodinexoz.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/11069835813.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/86125884990.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/63779351243.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/renakes.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2d3da58e3b0cfe5d6c49834942dc2670/86929004822.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/265536183f1ac9b3c87b175bc1ce9103/kosukulufopu.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_off0000bfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA2 11572 bytes
SHA-256: 9dfad1fe6e8ea6686a3a3c3ee941db69ccf850e81db8ed80816dbe753510d9c8
font_01_sfnt_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 17176 bytes
SHA-256: efe35f0d616a98e0a0a34518e4421a2ebdb307223841caf2a90c94f7037df3bb

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