Malicious PDF — malware analysis report

Static analysis result for SHA-256 612b2a0b83c7209c…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 00:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9afac470b326e3bf346310bc3df030f2 SHA-1: 92ba3ec9086f421512ea0a00938f95e0dd7c6b04 SHA-256: 612b2a0b83c7209c6e964a58f00042b5927c351aeedf14da55a225198cd263e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=powerlifting+program+5x5+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_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 18392 bytes
SHA-256: d7b50172f8f4be4be1d74b683188db84158e645bba8d976b47ddfb0b4c4b1a14
font_02_sfnt_off00012c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C58 10996 bytes
SHA-256: 4e8d0b35898c8eed2672c967edad408a4926ba186c111a715bf354da78850de1