Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8b6579c9054015…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 17:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e1f5bb6909a0c9fc76138e1c69b552e SHA-1: ff05669b2b3653cd8b132fe3aabce25109be9e79 SHA-256: 3b8b6579c905401585b409ff6b15a6346c242aff583feebb460c6e182bd44a2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing lures. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://huntic.ru/uplcv?utm_term=change+pdf+to+word+without+adobe PDF link annotation
    • https://mamo-tato.ro/userfiles/file/jakupi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/67085334a06da3d0f5ed4af9458deb62/dasodewefimumimoj.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/jodabisumizi.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/5715450232.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/42348915891.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/36667870979.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/42698411638.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/dudijipelewoto.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/31892175457.pdfIn PDF document text
    • http://agavietnam.com/img/files/fonokitevibawuxum.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/9e9868e281c4f6fb0156932a11e9912a/wogemomupazanomunezes.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/36rfjbh7hio826hj4iejn3d1m0/mifilor.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/logowijozajud.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///giwolukasal.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/a7u1pl2n34ec8adje3qu33g898/mixawazetidumorof.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/76551597216.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4f861cd0---fawapixixamibareb.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840dc692b5f---83755514667.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/44818186844.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/ronemadon.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/xinarewozodoz.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/57737374206.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF3 10920 bytes
SHA-256: 4ed3ae5a72408c9930c163d301689abb0613529647adb462fcb21d2dd0866ae3
font_01_sfnt_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 16540 bytes
SHA-256: 3d410879e96419d74c7f8f425c425eb24842299b0de2c452efc1b9be041046c7
font_03_sfnt_off00011954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11954 17588 bytes
SHA-256: 72231e451143fdc253c72c6a03e815f78e26964f47c8d6b26c0157905d636c3b

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