Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac66c4477b8064eb…

MALICIOUS

PDF

95.2 KB Created: 2021-07-07 09:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e79c05d39aee2aa376a795af7bab83e6 SHA-1: 8d6e7f99dbb7ceda63b4b273adef17f81b61036c SHA-256: ac66c4477b8064ebaac167ec37f5724b06bec81c25b99991c6ad36e0df7ef501
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://bukharajohnscreek.com/sites/default/files/file/62213386859.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ee252bc49805d9b671488227a0bf2719/10803783606.pdf
    • https://maxflowfans.com/userfiles/file/mamovuzilovanijuduxus.pdf
    • http://www.vinoplaza.nl/img/upload/files/2024790207.pdf
    • http://tweddlefoto.com/files_contenidos/upload/files/gukubuxevepuz.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/26c5c8c4ae968c54138bac9965d1f66e/nuzomuwozimobozezamaxexes.pdf
    • http://collectifff.be/imgdb/accueil/files/6687145674.pdf
    • http://arlingtonhigh1960.com/clients/881088/File/benelex.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/470d6b0ab75c2307f00a632bcc69d054/rilimawizo.pdf
    • https://aristi-trap.com/upload/users/files/67922264296.pdf
    • http://eko-inwest.eu/upload/file/nisugujutupiti.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c7b876d46d95609d0c4b8a613eaba34d/64491707092.pdf
    • https://carlojans.com/cms/file/gidexetefamo.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a65977923f5---waligujeluleluxoxipexofu.pdf
    • http://allg-gyn.ch/userfiles/file/jepesi.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8ec6a9ba57e8aa12d6c5f6eb2ccb1359/33945203272.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4d8ec89f0260862bfcbef6aeb483cd34/86436221535.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/90066991e35cfd0dbbb2c8ea95c10453/464251658.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/icdjs1msc2anbnnr2ugqnlg4di/63481975808.pdf
    • https://pbchistoryonline.org/uploads/file/nefefege.pdf
    • http://lakehighlandsrw.org/clients/863582/File/90014060460.pdf
    • http://atthaya.com/file_media/file_image/file/94846381870.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cc1dddfd78---17221554434.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2fbb01b829a1300d5b57f8df02faa6fe/tebovujowesafuki.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=easter+sermon+outlines
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001104d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 16792 bytes
font_01_sfnt_off00012864.bin
455da5a1635ed3c775577f11c500e9f53cef429f3531375f83cddc6b3425cdd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12864 10352 bytes
font_02_sfnt_off00013fb7.bin
f5352392050858ca67a02c69a00414e2c3737467a36d642c718642e81f2dad43
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB7 17656 bytes