Malicious PDF — malware analysis report

Static analysis result for SHA-256 20dd11d2f25ce2d8…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 05:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 41ddd4c7bb182f693843bdccf7e27d29 SHA-1: 532f304059846c9bc2d260580de4c91cdd0c8516 SHA-256: 20dd11d2f25ce2d8feee8722bd9d9b5c32a8cac6047a4e1cf645a66cfd4ae905
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=seriezloaded+nollywood+movies PDF link annotation
    • http://studiovalecchi.it/userfiles/files/xitabobateduluwisalud.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/zomutijajikagak.pdfIn PDF document text
    • http://goref.ru/files/file/15944610713.pdfIn PDF document text
    • http://momsystem.ru/public/file/15895350342.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/pifapupivuralevomorezebi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453fd56f335---64561057627.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/abe9de6dd012f82cbe560b45aab81cce/nijozewota.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/37618928635.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/17980646781.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/11162608370.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/25104684654.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/31269571335.pdfIn PDF document text
    • http://balone.net/_upload/file///57372073938.pdfIn PDF document text
    • http://snsi.jp/image/news_file/66199278547.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/58314718309.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/nurosulogazagezurad.pdfIn PDF document text
    • http://skia22.ru/pic/file/35609333380.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dijafawuto.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/58366805898.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/xofotofuxiwofusam.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jevvetp7r9ibvq2ahjluessl21/14015794021.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210905140717.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614059bc6d9b2---21200038230.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_off0000d540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 10712 bytes
SHA-256: 96d3edb298031a5a8fb4b10c957abf5a24640fa2b14e6bb7cf58f6d26fa54196
font_02_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 18744 bytes
SHA-256: d828238dc1ff087b74f7a222c5a3bab7e727fd1cced5da781fef6733c23ffd46