Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2895e1cd08ead7…

MALICIOUS

PDF

88.7 KB Created: 2021-09-01 15:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c84db8f05614718db499b0a7a9a3965 SHA-1: 6248b608edc7c2b821f9e7205b75d862e8c847ca SHA-256: ad2895e1cd08ead74f9c65f0582d7c2b1393e16baa595bc05dca4f1e00aee4f5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs for link farming, likely to manipulate search engine rankings or redirect users to malicious sites. The presence of these links suggests an attempt to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/bcfb7dbd1c47f3287b1a8ed814f4440a/dedopagiveruse.pdf In PDF document text
    • http://4grd.com/cmsimages/file/busakijuwimomanigexetutig.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/rigobenasonosawowez.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/98625775871.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f01b662ac---meratulipef.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c98a9d793d8---galifupelefexoxumidowo.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/50589051342.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/60918588696.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/39723359578.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610c2ac951fa3---37445160834.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/toch4n7rdu0p3sbb3qf87dtj1q/70582847195.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/gijofovofotujar.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/90243009045.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9af84b299e82159ad7977c4a196d301e/71404429661.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/54689762669.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/6595589546.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/1c71df34211d63f663ccd3d2ebd97790/59488038920.pdfIn PDF document text
    • http://stevis.cz/files/file/dejerunub.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110dd03044cc---pagozujogajodupupobujap.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/93536939974.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fffd5daa2---62498324683.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/4senji2jl2f6mk56ml0pr0rm5l/zopoxofatavewewu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160792cd0c45c8---47194485537.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9b13e9252---zusivusotezup.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7d89cad5700bf609c53dbe3e8c5e251e/kifexuwitunutuwuvibetufo.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/60727486504.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/vukobadevegewasiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=challenging+pythagorean+theorem+word+problemsPDF 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_off0000ed9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 11212 bytes
SHA-256: ffb6399a20969eff3c9bb30e01d7139f59f27214325965e7a7b61857126024ae
font_01_sfnt_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F67 19988 bytes
SHA-256: 5564125108e239ebb142a84e471664abb51ddd207fd3faf074cf2b8355c9c6b4

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