Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5e93a67223672b…

MALICIOUS

PDF

92.9 KB Created: 2021-06-26 09:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44adf639fc7db9fb080c04a101126692 SHA-1: 62bd4be6b276475ac9a6e30ea24feceb35897751 SHA-256: 3d5e93a67223672b397af08265855a493cd1650797b27917d5d5d5f17102a5c6
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary goal is to trick users into revealing sensitive information like private keys or backup codes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://arcomproltd.com/userfiles/file/85463349803.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/edb60af9692970777812af81082aa9de/87401200480.pdf
    • https://nucamsa.es/userfiles/files/72101144737.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4f26041c---puzobibavarom.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6e9927206---kazuzimab.pdf
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/53576384731.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/4n3kquvqgiahhtccj9oit8s7s7/mazedomadilefe.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095116d6efa2---xifeganemotegezibenik.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9158cac2c87620bc863fb0bff78991b6/zezono.pdf
    • http://whs1979.net/clients/65916/File/53003752966.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c15342bd54---19280313836.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079910701d63---2247831794.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/d6822223a43ba1006238b42a1ac2d673/mitumoxozugijupad.pdf
    • http://france-ex.com/xifuxomosovaxetuduzeken.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba42e6c61---97751677107.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609592a8e995e---vodanavuzomurew.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc189a13f0---34697619851.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/567798ea2edb235116e211108b870d83/mesagewokix.pdf
    • https://thietbidienmanhcuong.com/upload/files/76967608242.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b0aa98613---87500731247.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c723898b666---28587194440.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a740a9c58b2---kodav.pdf
    • http://www.companyforte.com/imagenes/editor/file/fisesovawa.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160939ec0ea5dd---bivij.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/vuwulaked.pdf
    • https://hagakure.by/upload/editor/files/87274657546.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cisco+cybersecurity+essentials+final+exam+answers+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010235.bin
e8aa8de81f6297c8d40ddf5c4865e86cc999de4a131e593d3cdd3492ee22c3f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 17836 bytes
font_01_sfnt_off00013119.bin
ae8d1dd4187d73415fddda748f83164509b514e6fd852b8afdb19e9ab031d4a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13119 11312 bytes
font_02_sfnt_off00014be2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE2 16792 bytes