Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bc1b94fd3d9464…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 20:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd91c399f63e6785eb8cd42cd51960a1 SHA-1: b14916f4a949b2541d1b9201f138dc6fa84025ea SHA-256: 31bc1b94fd3d9464f94767752adbd6fb6a680bf135d4f40e9b4dca88751ae3b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://residenzaeden-albisola.com/userfiles/files/vibokenufuse.pdf In PDF document text
    • https://papiratisk.cz/soubory/budolewadawerap.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/m27vaub9nbc9hkd98k116eqh27/jikudadafob.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/moxuzar.pdfIn PDF document text
    • https://robertbah.si/files/file/biretedipidomi.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/jususabatuje.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/nobexawosulepodati.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/d0ded1b65a902c3bc6b62434a666d917/dojedipanujelasudazevin.pdfIn PDF document text
    • http://xycrusher.com/d/files/baxivirakezobawive.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/rejabezagiwobo.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/13403840803.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2972d7378a---xasiteronadaferupexenuwa.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/860e45b6da49426b2d6ad82c165de842/pibaj.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/7586767217.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6431c8719---79098420220.pdfIn PDF document text
    • http://kechengchem.com/upload/files/85926248176.pdfIn PDF document text
    • http://ciskmv.com/css/file/13611133962.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/96285696969.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ff051431d801d3179c6e0c9f49c505ed/rowowubiresijelotopujefov.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a37e5cfb1f3f02bdb465a3b921ce8b25/vifesasanowivepovapogisi.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/6333489009.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8bd6046f2b400221a7486d46f1752546/75133469884.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/kunuminudubaxonirevewow.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/68gmg2p9uq7t5gc5go4a7p20fb/tuxukutirag.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/n4uq3c2et38eqhv02kcq6u8bfe/wozutizataxanuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=logic+pro+x+manual+deutsch+pdfPDF 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_off0000cf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 19920 bytes
SHA-256: 38b0b54042ec12fe79ced3b31cc181424497be0f645bc22ff4c7640d9ec5089f
font_01_sfnt_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 11224 bytes
SHA-256: be4402407b5d183a6fcf40f98aaf0cc1f2fdfa679567523b295823b6c58d6a10
font_02_sfnt_off00011d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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