Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a75cab36682072…

MALICIOUS

PDF

87.5 KB Created: 2021-08-08 04:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a13958d63d0638f41db5ffd40107eb1f SHA-1: b849d2e0214fc5bae0fc25663b75125b47db999e SHA-256: b6a75cab36682072bc04152697b9d4c71547b8cc3a0852eaf51f72209e4779dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bf86850e3---16027445864.pdf In PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/furuwaduwifi.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/64281673882.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f0979f0140e7ae98eb35fd7250cf94c5/komogi.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/sofavusata.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d5a618f510ece0582e7d82c960f4c2d0/xiwaxajowif.pdfIn PDF document text
    • http://jimmartinfamilyreunion.com/clients/35696/File/nemaranuwesagofako.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b56c1c0164c---dufozimil.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/zewexiwezakimidira.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/rokexusuwil.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/11172786535.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050512500773499.pdfIn PDF document text
    • http://broomfield82.com/clients/4/48/489ff1710263d1ca947d92387d56c809/File/gizozojotobafubisedipuf.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/04a9af2e99df0774e1b5fd529acbe028/liduzosimajutew.pdfIn PDF document text
    • http://www.asslar.de/downloads/52634698769.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/muzikudanolamev.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/46255760933.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/94115211546.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/lorekogigakunib.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85422528951.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160988a0a35127---zowif.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb1aed6ed3---5124371063.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/kg9pg19tr8ea0p7bs0lbmjd43q/vitisoxosisujimoxolago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bianchi+via+nirone+7+alu+105+22g+2020+reviewPDF 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_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 17500 bytes
SHA-256: d823703113178c2c1b98a7d96086ecb0feda81d6fa7b7869627ba1ad4199fe8e
font_01_sfnt_off00011b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0D 11024 bytes
SHA-256: 6dafbd5aaba0291d7caef9d1db4946e2243ecaa29700d65bb7d23d3e950a4b45
font_02_sfnt_off000134db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1