Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9c9eabf21de7ec…

MALICIOUS

PDF

93.0 KB Created: 2021-07-18 17:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d62023ac6a572c0c5b9051fc0ad0701e SHA-1: 869f19ac7ec7de59001a143874fce2273538d68c SHA-256: ae9c9eabf21de7ecd90e14c46ceb1b33db3960a93c75b774f97b3c9fc7248ff9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bca28ba4e---12092271092.pdf In PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/id3196qdnf7p8i70js01shpj3a/57152626383.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c753878ce---bigegabe.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/mawazisixelifizigebimopaw.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dd48f2a7e---78827585900.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890abfaa7ab---vekid.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969e5c8eee5---vofomikarifimagix.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/33481325158.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/loxaponogadevumivumoxalut.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/82751f20af40ff7db2f8002e12e76647/ridiwisoxolizukefe.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/51934ue0ng9e2bee8nivcchrd9/tifapemodiretimubibeg.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/ed4b9f6d03b14beecc316d9efd1fdd40/kexus.pdfIn PDF document text
    • https://ikima.fr/uploads/file/4937480121.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdf0b3b599---funolojeninubimesosu.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/rapodenepebu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/2418a4d229341cd830855d04a6f30918/razepuridikepo.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fetekeparafitidelopegis.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/zefifebukarikagakinava.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/54212490411.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/bnotlv5rf28ba5lte1i95ggr2o/patodubuzibuberopopusu.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/93248766118.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/zetototuzata.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/2ba7e14bc3112590e9009ffc29a7a566/wudutuwafuwujuxekodavira.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/dodafezujisiwekakaziru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=foreign+trade+zone+21PDF 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_off0001097c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001218e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 17332 bytes
SHA-256: 995a3e64926403c929b633c1c8ec51ba692aebd7ffbba3b7ca23ed5375880f3e
font_02_sfnt_off00014f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F25 10416 bytes
SHA-256: 959c87070e37633838fa5736f5abfd3d62b086c6bf7e19c18eafdfd1d3382d33