Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b7c29eadb2bf53…

MALICIOUS

PDF

99.7 KB Created: 2021-09-04 06:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a88278db6a79f8106f2c5e3832186277 SHA-1: ab55c52f90386bc7beab9cb9c83df07f2df5cf9f SHA-256: a3b7c29eadb2bf53d0c5310fe0232bb5b0c603fb95b3cd4af825a2642c999aa2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites that appear to be part of a link farm or hosted on compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or to distribute further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://fibertechnique.com/tmp/file/gurukitasowafuwiwedurux.pdf In PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/jovegoxagenegu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/fe017b5a786ade49a259e89fc727634d/73707888404.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a2c882d1c---76259558710.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/xusanogewigixusakof.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161142838091ca---86555707150.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/e0c311fou1np4ndbvrcoggskp3/barezuvujiwemodepoz.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f2f40f3c155b7fe3716b344a6c79bf50/72314464461.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/468e76a73bfa782b023b8eefa6226220/27428850082.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/bibivig.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/duwofopuwikemagud.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/faripevawadorex.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/minekodogukifap.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160edde752dee3---vifami.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/bekumesonofoxukozokatil.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ab4e0ce25669884198313405acae4d0d/62903679563.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/22933738897.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/takisudujeliduz.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/993e6379ccbf6f13a92d4e929bbbd65e/98677535782.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1amiscdc5h7nd57igal4fq9qj7/warakulevi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dd915775d---35980797334.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/29251506521.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/65535244511.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/72518278706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=2000+suzuki+grand+vitara+shop+manualPDF 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_off00011daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C6 11168 bytes
SHA-256: f14cfd54c81672fbcc203f4d1dc3444ef6a3e9bcbb39dea7477b921d2b2a854f
font_02_sfnt_off00014f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F87 19120 bytes
SHA-256: c960658a07105e1d29868caf72525fb83a83bb23452231482135f417ce69187e

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