Malicious PDF — malware analysis report

Static analysis result for SHA-256 be09ea67b732a1a8…

MALICIOUS

PDF

75.4 KB Created: 2021-09-02 17:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17d1584111835ecd35ebbced8590ff6f SHA-1: aaff736deb45595c2727b156263ec47b8a5b8119 SHA-256: be09ea67b732a1a87f5d6973b5dc8b829daaefd4e4351bfbcb0c573b178b2ca2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains flagged as compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://namngonviet.vn/user-/files/82915131515.pdf In PDF document text
    • https://detector-billetes.com/Imagenes/file/keromoxemugajabila.pdfIn PDF document text
    • http://cloverdiamond.com/file/wamezijubani.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/jefogexuxitar.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/zemixewasalomuke.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kuwipajilijomeku.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/97997362983.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/netaneporodoraz.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/faefffe7727f802c1d98ac7f55682613/jesovoditero.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/3903457700.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/85a32adb8afd6d82dbd13ed4a89d150f/xuxolumabejipoxifofulasi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16072916ed9946---molewod.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/30b476605d459f2cf9de7d26d84de4f2/91216248555.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4328ab86327cd70f7b09b4bd0f55b487/25480606480.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/dc75f61c66198d8f80e61a05c668175a/kazolowifejenuwipofojetir.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5dfcd67cc7---runipob.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/tavipajor.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/22321592870.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d47baac4b1e---litomezov.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/16987497456.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/qkqcb2855qg867c6haussk8sd3/rexanamemezelep.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160782daccfd84---13516111729.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/wesutaninulagoz.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ace3277317b---xogejex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dinosaur+origami+diagrams+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_off0000c3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A3 16944 bytes
SHA-256: add6dd79a6b2ef55597d3850caebfec24e3f54f28d09c2cec40d29256531dcd2
font_01_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 10664 bytes
SHA-256: c5b1458410e9df08009072fb1756509b195f3dcc7387e84fd04d18e3052bae27
font_02_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1