Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3c101750388066…

MALICIOUS

PDF

69.0 KB Created: 2021-09-19 13:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db9c2a3cc4cbd6a6c3d73b929d6481f6 SHA-1: 92efc4516927325cdb7e90ddb59521cbca6ffda3 SHA-256: 3b3c1017503880664383ffdadbf48d14cc578265aaf5d8f47009bfd84a638ce7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, functioning as a link farm. The primary purpose appears to be redirecting users to malicious destinations, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=ipad+2+android PDF link annotation
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb05c083e8---sokujope.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131bcc307520---45155570302.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/71769462428.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6apjoq5v1jaceb6vumsu9b9e9/xewobaluwupipar.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/nexadozovakoreloxilotitef.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8d5adce3---reroxupavafuxudiwasu.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/kajesufalesa.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/gemuwujuwen.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/dopiwetus.pdfIn PDF document text
    • https://titishop.co/upload/files/43069784420.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/golumeg.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/86489168333.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/pumomufidixowiz.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/ganev.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/66936624284.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/sajewam.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/tekukukava.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/87274154150.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090814002449.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/12481485068.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/ratede.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/7446955363.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/xelosudijidoporafet.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/99083297041.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_off0000b20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20F 10012 bytes
SHA-256: fec65427a4dfe9a3498527f73b5766f0f11cc46e0fa4dee5bc64eeb7af3e7546
font_01_sfnt_off0000c84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84F 15540 bytes
SHA-256: 2bb00f7d589a2b9aa0becb0b74e3fa6cbd6fa82323bb166ac0bfedf40d0d977f
font_02_sfnt_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1