Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e28d38b4f18b5e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 04:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 03ad955750eb03bf410ff03091d235e0 SHA-1: a6f8fb4334ada43acb7bb85248c89b7e9cd1747c SHA-256: 87e28d38b4f18b5e8acfc94d37c957f6c35ca4a6ce1eea966ee5a507155f4393
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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/nadawifamimezu.pdf In PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/kuvupasevu.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/vujexakudetugimuwuz.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/pivatipeze.pdfIn PDF document text
    • http://klaaswester.nl/img/file/mojixel.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210909042440.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/jugipetabivopiva.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/pamefesugosugijaxubi.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/nawikinovujekiduteb.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/66654842664.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/23915055706.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/72qi2co4b1v3q3pqgevgibc74h/jerufekesulemesalan.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f1bfdddb1ce4db5e8509f9d353b428e4/dagowamumusof.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/ditubinub.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/25743186172.pdfIn PDF document text
    • http://kesifveotesi.com/files/30850246892.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/39566770672.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/jobusasef.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/budogi.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/nokosaveluliforatu.pdfIn PDF document text
    • https://salwangurugram.com/files/73437922644.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/xugivotefukut.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/88549912862.pdfIn PDF document text
    • http://12shio5.com/contents/files/kikozokuwakudarilox.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/jopozogeg.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f76cb7bc99---kekonizafozoxezu.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/18331901752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=stay+with+me+jessica+cunsolo+read+online+freePDF 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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 17924 bytes
SHA-256: 2b181ab3316e805c434f0e63c6deb13bec04fb8feecb102d7acf1c6b6154c79a
font_01_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 11244 bytes
SHA-256: 14f05df2cc017f044130d1e2a754b97af5fd53628211576def4f5dd5503d0f39
font_02_sfnt_off000122b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1