Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fe55a9eaf6b518…

MALICIOUS

PDF

86.6 KB Created: 2021-08-31 05:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d99451aff2020a9b7e9ab1a60ef80c47 SHA-1: 859f360f4dc71e6c2f92739463afbc9dd4232ed3 SHA-256: 80fe55a9eaf6b518d38a7299c936fa06dce23e39fece68a9f8f45ef680ae68ee
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which point to PDF files hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms for SEO poisoning, likely to lure users into downloading malicious content. The embedded JavaScript, though not fully detailed, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://leskovec.eu/files/file/vebebanasonefejeva.pdf In PDF document text
    • http://naturalmis.com/userfiles/file/kotimekipoxor.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/76657143623.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/nevokumumiralefobodazikuk.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/18947454876.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c660440f0c---97064178896.pdfIn PDF document text
    • https://kuepancong.com/contents/files/84417776476.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/39265820250.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c0fcd7c5810c3d3324151ada9fd3e34c/wudetatir.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/sijum.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160821172eb546---losedomorafet.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/24379601099.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/vekalel.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/77729255969.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e62f8a7ff6f---mapezuxava.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/cmuqrsijimr4e5b55hkko7gvc2/jabumokepirexoki.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/ravim.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/38135619609.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10431371364.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xinisuv.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/luram.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/90943228514.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607946e998fec---waluzaxoxuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=harry+potter+and+the+deathly+hallows+pdf+download+freePDF 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_off0000ee58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001066f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 10692 bytes
SHA-256: 4bfced8db457b7b43329072246b980768eb420136e3cd4ef2380be5ddbd2bc25
font_02_sfnt_off00011ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 17620 bytes
SHA-256: 7d91a0f70ba51db8faf284cd5188e5a33185ea5151a90477fd2d8953ae372cab

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