Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96bdbd53b7cd1b7…

MALICIOUS

PDF

87.9 KB Created: 2021-09-16 12:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 31bed9aabb3414e1bb0f99c004f2c1d0 SHA-1: fec21ca1edd73d6962884d4276fc7ba9a5d4e49f SHA-256: b96bdbd53b7cd1b7d060eaf2bbc0a44cd884bf79ad0c1da7d6a7e48bbc247e3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs pointing to compromised websites and disposable domains, suggesting it functions as a link farm to distribute phishing content or malware. The presence of external URI links and link farm indicators strongly supports a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=after+we+collided+mp4+full+movie+download PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/257e1cd8ecfb66330afabc57dbdf6fa0/4884281821.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/sudogikinoliw.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/93242665886.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/pumukekeroritikelatiwege.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161397eb4e3540---11453144823.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/43046090778.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/78685789204.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/kufukixejixodan.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7acd76ea---96761597507.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/06/76814112361.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/146d553ec458d1e8897026a78dbf4bd6/99164691215.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210907050158.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/wogumijeb.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/ziredabuxirubogafo.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/hq5oo3nf8ucs0euthuaqrlje34/92191043371.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130daabce761---51838976843.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/kiwenaxobekebadupomozatop.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/23047499683.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/84618321991.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/95162417230.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/bofab.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/pekugumoda.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d3031cf6---15300927840.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/tiremitoxo.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_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 10924 bytes
SHA-256: 448261f516c8e17217a809da174da0838ef5aa20e1fe657eab76ecd2cc1dc0a2
font_01_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 17756 bytes
SHA-256: abec9b530057a3c4ff7378f324ab72e9a9b28ad47f8746516382913bb514368f
font_02_sfnt_off0001394b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1