Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f87228dd7e3276…

MALICIOUS

PDF

75.4 KB Created: 2021-10-05 18:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 01186555d55d489342634132ea1d3e9a SHA-1: cae59c38e7dc048160c879a7715f21213455bdfa SHA-256: d5f87228dd7e3276cdbb8a1066b773b1ac4d45661c7f109a8e40695beded2dff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=fish+that+can+live+with+african+dwarf+frogs PDF link annotation
    • http://trungnguyenjsc.vn/uploads/image/files/rezelewajajiwil.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399ac14eea9---mugatixugigobonelajowexos.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/vorukifodadeno.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/62453890959.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d8650ddf7b661285ec08c8b397ac0d15/32665604927.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/laruxatowi.pdfIn PDF document text
    • http://boldogelet.hu/media/binimezepanunu.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/rajiridebadunapavorebawer.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/bonulonagap.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/vr6in9fas5nhg0e5052s0aeca0/vubelopur.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202110020003339542.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/zolekefupozapaxumerete.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210930204809130.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/78759383431.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/libetukijutivobatepukiwu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/846b2a43852733f25ec260ef2aa1dd49/lugikakazokafo.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/runovu.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/91995028241.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/towuk.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/54566358640.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/worudowo.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/61305349b88d4.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_off0000c000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC000 18308 bytes
SHA-256: 352e2a086969ff3eae41e5bc0998bfdebab23254cbd5bd6e9b1f819a4a5d1d90
font_01_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 10884 bytes
SHA-256: 8067ac359dcc35c14c496d680b82e323e0f4309071e0df5aea12ff1c5ebd2509