Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bee08ee62d5c90…

MALICIOUS

PDF

71.7 KB Created: 2021-09-21 15:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aa5d45fd757d47de351ed0ef7d01d16a SHA-1: 79ef7874213d9448221209c74a77f6beb7da696e SHA-256: a7bee08ee62d5c90791b3de4244a24a077d89daec9952a35a4532a670f730740
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised WordPress sites. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pixomot.ru/uplcv?utm_term=slugterra+slug+it+out+3+apk+download PDF link annotation
    • http://9y.bfage.com/upload/files/20210906043024.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/gojorevibodikufefig.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614851434bd22---5480233441.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161385d93c20de---sedanasinogaja.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5afe31beb---rumubo.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/96864214695.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/datemusus.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/giremajifezera.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/44129360966.pdfIn PDF document text
    • http://wawa757.com/uploads/files/begovukukumelusalugorudo.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/lemaxavubivasu.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/24927684762.pdfIn PDF document text
    • https://wildnaturetravel.com/File/lemenasetawup.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210916210519.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/59348019161.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9a848de541bbf65c4a5cea945ebe63d9/67092721288.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/102ccd60aeb80fb35568798daefbcf40/45795091318.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/87259796135.pdfIn PDF document text
    • http://bscartridge.com/pic/6884814769.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613d271a78ca1---tofobixu.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/mamawerolop.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/64841944223.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ef268b1c6---63241142933.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/83534017822.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/rufov.pdfIn PDF document text
    • 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_off0000b67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE91 11092 bytes
SHA-256: a4891262787b9e25b466a2dde2baa8a685496435e50047a983dc5af4915059c8
font_02_sfnt_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 16124 bytes
SHA-256: 804ff78b5de5a1a593183ef67ff1a5d17b7673cf354a327ba6166b78064e39de

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