Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5d5848f82d5d3c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 10:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 361b1b43445319fc32120034b67c75bd SHA-1: 55812ea57c0e5f85d0fbbd93532668ff168d5e4b SHA-256: dc5d5848f82d5d3cd2cae0ee3cd34d543d0acf12344623e9c183f17d333c2ae5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of numerous external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://kemenyseprosiklos.hu/upload/file/vutikegutidox.pdf In PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/288aef3dd893284a1406f0f3e448f0b3/jasiguratevisinadagov.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/63433775754.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/5420539873.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160df7c7786a85---92062630438.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73417d0d91---25537509041.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/32963957207.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ba4d3c21b7bbee2204c7bd67131c7f97/18472340866.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a82b4da33d9---regesepemiwuvufoxi.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3341b7412---sivabovibafimutuful.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/422fbd95614be222a7227e77645b39cd/topok.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/38934227182.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/fdf5b45a6ebbf00b9dc6711f016bc7bc/17450341130.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0f2f50c27cea057acc7f39659601f362/9589279245.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a72c69b0e9ec06f0f12b625ed596ded7/fumexizoredesi.pdfIn PDF document text
    • http://flomojapan.com/upload/files/tijupivazo.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/guletojegar.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/15095837641.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/retew.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/wikunavitejaket.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/77169630374.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215111929411983.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/popivosefajiruvono.pdfIn PDF document text
    • https://soechi.net/userfiles/file/wunimipalobuzuret.pdfIn PDF document text
    • https://bbdirect.com/ckfinder/userfiles/files/zupixoxarejamoritin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=genetic+engineering+mcq+with+answers+pdfPDF 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_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 16756 bytes
SHA-256: 1d50697d7487c58a26a375d2d4ab4a36660b79761e4e70abc283227a686ea19b
font_01_sfnt_off00010792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA9 11172 bytes
SHA-256: 3371319736e94fd1ea7f41171709af567837c833136c3d1ecadd26ec6a835c2b

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