Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4fbd3e505dfcda…

MALICIOUS

PDF

86.5 KB Created: 2021-07-03 21:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc764d09676b9386e1a6f98294ec43bd SHA-1: 3dca84ef77fd01b2ea35a6081b590cb6ae608abc SHA-256: 2d4fbd3e505dfcdae384ac43b01c434ac4e9ae5bdfdcefa277b836fb882112f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic and ClamAV detection as a 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were directly extracted, the overall structure and URL findings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6b12bdc93fbe689d1fef04a6a1d37104/28694807314.pdf In PDF document text
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/posid.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/wamijekikurijipiforamud.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e7b69a794fa1e3296a1fe8e0a1d10896/41228728902.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ce56f29ec9716078e1220768c74f85ee/nunebunuxid.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/berizugosevijegebe.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0720748af1---vosobabenuvanema.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc98dff3442---rurezepifunetute.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tajofuri.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cf8a8537ca747ae3c4831cf6afcaadc2/jokowunadusugaw.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/a1g3mvcoapb4vefpg872lrvs5q/3927738077.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a422ac94c---vuzitejaxa.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/66281065444.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/86945932163.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099e181a3923---56840289453.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/70110035702.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/88066604574.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/df0e0c0ddb4000c250c9a056e2dd3ba9/27747490046.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/92223442611.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076dd4429547---saladanovazovod.pdfIn PDF document text
    • http://com123.vn/uploads/file/wisefuzorexizon.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/fevatolorajenugadajozave.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d09loe1elunbdu089r39oeluk7/37991062144.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/9271461183.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a05928a6---nigoferupavuxitove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=latest+kodi+version+for+android+boxPDF 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_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 10656 bytes
SHA-256: 125df86bc79df34678abccae14cc83f5fe163550c8a97e409bd7eb4459fdb0f4
font_01_sfnt_off00010561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 18000 bytes
SHA-256: 20306d7ffad3dd1d1d98c0f0e97aa6e0c5dd128bd900b5307affb8726aafd31e
font_02_sfnt_off00013434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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