Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb2efd153a55c67…

MALICIOUS

PDF

86.4 KB Created: 2021-07-18 09:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40ee932b33af1cab13d976626641ab3a SHA-1: 9078ac632176727e63f4b886fb90cb2042c0f9b9 SHA-256: 3bb2efd153a55c678dacde0923b6c331e7b168714bae0470f674aac54d41b25f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075afb07545c---fulipifozazefolup.pdf In PDF document text
    • https://dalilak1.com/userfiles/file/vakur.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/fivejurogopom.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210701214525.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/norinipileranitesokof.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d9e42f9f5a7ce16336db6cb0dcdce97b/wosokazuzidoposazaju.pdfIn PDF document text
    • http://haphadoor.com/upload/files/37824123385.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/berabevekaguzanojotiv.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7e5453c9---1245085076.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/faponev.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/67464287162.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/98503638707.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607247057aae0---liretijusapubufij.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091393d9329b---kiwelep.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/jumawofox.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kk52lj268ouui6v0boe4srhkns/12934273648.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/kmssena9930ipt15ompfli0dje/76603314496.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/rejujodinexipedek.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/vbs2139h7jomfhmplig5bdq07m/mixesasupik.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac557c17d---xowanuxiwe.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd66827fd1---5952810606.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/demekenawigovalopumazi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8303461abb---66594150492.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6db1ee313---venovopukovivo.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/i7nlmii67bqpsts534o8as4bb5/juzikudidipo.pdfIn PDF document text
    • https://hoalavender.net/upload/files/33538588631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=coral+fish+storesPDF 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_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 17472 bytes
SHA-256: 5b7e3602af496c52e1bc31c22f609419aa89d545e51683cb16730cd89590e31b
font_01_sfnt_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F1 10236 bytes
SHA-256: 73fde9aa9ffceb5b4e24c7d4b0191e26219709aa8a52642c0f4a9f5b2f811bd2