Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd1be733d179e7c…

MALICIOUS

PDF

100.1 KB Created: 2021-09-01 06:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5ef828ab80a1b6a0dee361a90cf3937 SHA-1: 6eb0b7d49bfded3c37ed42252c66dd1a2d989c77 SHA-256: ffd1be733d179e7c3d67a0a8523b32d79530ab6f38f480cd3b0bbdb04e26d645
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous embedded URLs that point to compromised websites, many of which appear to be WordPress sites utilizing the 'formcraft' plugin for file uploads. The primary purpose seems to be directing users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cructi.ru/uplcv?utm_term=song+lyrics+that+use+personification PDF link annotation
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccee23aa50---batolejudavupogobos.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/nakixevufulamofawaki.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/32677202810.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/30494246324.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/sinuduvamewusapij.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea4a809ad8---dufuboluwezajovugufa.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/bovomojivatu.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607258e730bdb---43800173937.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb8251e50---rorejo.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/79018505150.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89c7656785---75357806593.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ulfbinof62n9f1i5j2us3mn9k4/22328553286.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/riwijariv.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/99003919685.pdfIn PDF document text
    • https://haidangpc.com/contents/files/9827093654.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/nurukijabetoteweboredef.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/432760627963f432b2be6015d226858e/31654142818.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/dba7b481e60d770416565addc3480d2e/29254930468.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160777611849de---fewazovesemuvaxavufaza.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/95754149593.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/58375889146.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/49145711555.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/xuxopekatireveduguwiroro.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_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 11048 bytes
SHA-256: 038f082d764099ab467bfa8ab189daa0034d4af0f6dfd90aa4045dc34ce2776a
font_01_sfnt_off0001398d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001519f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519F 18892 bytes
SHA-256: ded39546dffa9e959ed6329e6c1137c55694bdcd3f5be84279019b7217aa035d

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