Malicious PDF — malware analysis report

Static analysis result for SHA-256 f330a0268e6c75ef…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 07:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1753a45ae66c456706e7527c15f8397e SHA-1: 9d4ebdd90acaa4989df5fcd5630a2bceb202e978 SHA-256: f330a0268e6c75ef42b4c08e0eccf773e5336756300918fe45eaf5d5d8642878
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://aliceinformaticasrl.com/user/pages/powuvifepatetumi.pdf In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ka3bmm1g9n2m2b005bp8csib1g/dobogagekapezed.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d8166983d---38214670416.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/8q6uvtvas69fuiegsodo3kfef2/31059063327.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729bb0d1e6c---85188668351.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/relabavobukalakuzatoja.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607198e22ecd0---38876825333.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/83378658621.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/dogeriralilarixonobowej.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/fmg2nss7akoc8s5r727qilajdi/vepivesaradulijo.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16079c33d2994e---58601893867.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a6f2d78a---puwesi.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/bojifexesovezifujojodi.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/9757439306.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/52133685648.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021072610244773499.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/7420121985.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/jefemelesejijekowom.pdfIn PDF document text
    • http://cristalensi.com/public/File/93579604838.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093b07331410---tejipotamikunokesik.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/mupatajekol.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb0a3d9353---bobolimixazetebim.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/91036573004.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160872c38e8f6b---doturev.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/juson.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=government+jobs+for+graduatesPDF 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_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 11036 bytes
SHA-256: 3763d02b2bdb6d21815c6dd311dbbf906a22afac92ba6084ddccc8cce87e0c13
font_01_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 16784 bytes
SHA-256: 5ff6e7f72fb708ebc48b1e5fb87613067569cea286e001c25792bb197d7b755a

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