Malicious PDF — malware analysis report

Static analysis result for SHA-256 9287eb0e16e15a78…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 05:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 173a402360139f9347c44852cce95180 SHA-1: b03073c7513ef2d95dd9adb71c0100cba26d239c SHA-256: 9287eb0e16e15a785e08df8cc6fc8d3dc3fbb0ce98a3025a96f077cb5eff3b06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links align with techniques used for initial access via phishing attachments.

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://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/wobavirurojo.pdf In PDF document text
    • https://10fci.net/userfiles/file/varogorarijamij.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/lilodowagavidapewe.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/2107001036.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/46761167381.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/56986747481.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/dl5idahubfvhodq4e275lb9snq/potukulowuwegazeruxanid.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/siwugawabalu.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/tudebanibewuwiz.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/netakawivemezadisojaxolo.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/45806757414.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4j9ejussn16j2pps8ka6prhj17/vubudugawedavesunul.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0c10d3cda1b36f2bd12b7d99d0b3358e/bitinozizujarafubizujikir.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/filirowil.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/dagofebotupiv.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/zibogesefe.pdfIn PDF document text
    • https://maria-galland.ru/files/file/34179402623.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/nebusivil.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee95163b9f---jegusexafonupawolezalek.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/xiputipifibav.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614038b52bd65---80181420628.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/57704533343.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/59241706892.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af7ede695b---57954236311.pdfIn PDF document text
    • http://topstec.com/d/files/33609344575.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/8235233230.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/42547962630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+cinema+hd+v2+for+pcPDF 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_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 10892 bytes
SHA-256: c45996fbf2a05e98eae36c95159fce40f20a50037ee92bddd6e6829442c7dcd0
font_01_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 18840 bytes
SHA-256: d06266aa711dad29901262fea6b00da4ae8743da39c86a9c7953b1e5bc2e9e00
font_02_sfnt_off00012a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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