Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e08dd9315170c06…

MALICIOUS

PDF

73.6 KB Created: 2021-09-25 18:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 77cf04a1ba1e8bbbfe3b6c21e5e401ce SHA-1: d78fcb01a5b2d9ef61fe1b40941db26a41863741 SHA-256: 8e08dd9315170c061f2cda98bd8c4670368bb21211830f6723a7d24392af3d9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to various PDF files hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing campaign aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/sujepibejel.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/jhodjh5alc97oagr61d9om7pm0/dopavosogezupojolakeburo.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631788721.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/45823111576.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148d4572b034---6145898848.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b04956b5c---xinufam.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/kukadeduvaz.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/29768861636.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/sazerokijinim.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/vedif.pdfIn PDF document text
    • http://pedraferro.com/files/files/11046149376.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/rezodepafobarufizikodu.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/82959971933.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/37396584.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f770cf247---foroforagazigot.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/rubunevoduxinegav.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/41301366280.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/palexixixo.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/74200762869.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/jozuwonenebegujovimugejin.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091723004173499.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/rudanagetafe.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/202208195174.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/jukenirura.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/50807705643.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/79983541415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=poko+game+apk+downloadPDF 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_off0000bb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB35 10456 bytes
SHA-256: 5de9dc333534292f9fa890e7172719cd2cf51312d99325424604066dd23874cb
font_01_sfnt_off0000d2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C7 17608 bytes
SHA-256: 85d3d520237ac8cc3cce9d205546eb517888a103eb3d6d22e93e464072802698
font_02_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1