Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b9b9c5fc6505b3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 14:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 760045e6f9fbdef303071af3d9d4e5a9 SHA-1: f6613673aae9e183f064c7fb69bbf46ca32eae2f SHA-256: 79b9b9c5fc6505b3edc7d5f947eaf2c822f68eaa509db0cbe5093ac062c1ee9e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links that point to compromised websites and disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to potentially malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qc91i9607k2k6onufognrttile/taxigomewokiniwuwi.pdf In PDF document text
    • http://loveperfectionschool.com/upload/file/dibiwimelewixibinirigel.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104942fbb055.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c09bebce02---48799887872.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079ea1f65b46---vepobere.pdfIn PDF document text
    • http://email-database.info/userfiles/file/dopigagazajerozum.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/ponivezutosefanujipe.pdfIn PDF document text
    • http://jump360.co/upload/files/20210608012623.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/83cefa02fb50809cdd845320eb4006fb/78509360506.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/lemezojedidazajegejidar.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/wuwaravimixamidewivi.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/pevanuzolipiza.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3fc43f342044819f457a67b848ecfc99/tepuxisawuledodurotese.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4066a918a---71626292165.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/58885200350.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/2509087496.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee27946ca4d---25368173368.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/d8867106754b5a1b8364058bf0ec1226/99446215488.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/fixasisajaja.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/magurewuvif.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cefaceefbf---6258999691.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607279cade1a4---41296020195.pdfPDF link annotation
    • http://ozanatalan.com/iboard/includes/userfiles/files/vemolorizopepejuzed.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d41fa856902---fonefabijesolebosum.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/17/file/24814351204.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/baxobawakobamemigidew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kindle+paperwhite+manual+2018PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB907 16144 bytes
SHA-256: 7d45fe701c295bee0bebd04685f4f82360f8d3be46173c1f920426586425dcbd
font_01_sfnt_off0000ce88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69F 11048 bytes
SHA-256: 00c09b5d071fe449ff78a3895fb5c5f99a3b3d65defeaad319a2e3309e115679
font_03_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 19312 bytes
SHA-256: 34ce9b26a51bdc1eb277e1e45510ed41db5de2e590f98c7f26a6fca138088beb

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