Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7bb8e7a2a223f2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 22:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6ed157b7ab071c6fddf6ea8d181d25f SHA-1: 74ea508be83a11b136b2671eeacf8df3d83560b1 SHA-256: ee7bb8e7a2a223f2d3a4d42fae2496c0e10aabdd5a175443bc4c1f56d02c76e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farms pointing to various domains, many of which appear to be hosted on compromised CMS uploads or disposable hosting. The primary function seems to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=yellow+leaves+chilli+plant PDF link annotation
    • http://taispacedesign.com/upload/files/ziget.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qc3udtr44b5kqm0l3f1hfnkp20/zewekamuropi.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/mipimovugiwavidusiboputu.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/9e973231b0a4e4481ad1da1f63b4298b/35193167120.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/21117057485.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/jurizodadorur.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/22332390045.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/kipere.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/tasafisidef.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/67cv5dg11dlcnem8714j551udr/8169942975.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/80310659170.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/kisuxazonibukobalugedewup.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ce06a37d3---44448254440.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/davugemuvibupiwekela.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/17071397162.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/4644567593.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a42f751cd5c---lojunirafewibaj.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/24117232581.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/gakewiwamobuxez.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/nufelutasefuvifupejetoge.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/3567c5c25e9fec784d4221adbd8a9563/fakafeb.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/02plmuoileqp9urpbdlb452ak5/nabisabulifevozorixaropi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc3ef9c4f6---76581749887.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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 17976 bytes
SHA-256: 2ee20ef2e33a58848ef009dcb814a3dc10e0c28fed30b99e6c55c6ef7054b52a
font_01_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 10508 bytes
SHA-256: 2a191ca66c0416500ba0b565cddf6a92f5c1b8c8fbfd40c64ecb9af9526b7c3a
font_02_sfnt_off00012394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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