Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee63e18a5c839381…

MALICIOUS

PDF

77.7 KB Created: 2021-07-14 10:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3eaefde30a4ddb1ab3ee438e10b6f3f SHA-1: 1205462b406a35c927c6ea228be0f255d3f857ad SHA-256: ee63e18a5c83938163eb0fafeecbb66370d529a206cfe2143906afe730a5f6b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, with multiple distinct hosts and a high number of links. This structure is typical of SEO poisoning or phishing campaigns designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. No scripts were extracted, but the PDF structure itself indicates a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/7qgi4gbt3aat0r0btioo2vcq50/dutapesapuwomopuzifidet.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/d189544d9e59f056dd98e119a5b2d710/vuluku.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/c88023e71882a1ac4c458828463ca510/79696031403.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a51ecc5e681---laniwapenatowuvapawomoki.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae64b087042---7782005898.pdf
    • http://agataklimowska.pl/userfiles/file/tipizajopela.pdf
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/medemana.pdf
    • http://tele-fonika.pl/upload/file/47850811973.pdf
    • http://sotel-perm.ru/site/file/ronadisetumofutomewipalex.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/ce57c4b702e2343ec04f96cc69cd981a/66674429325.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/26384645252.pdf
    • http://builderall.info/userfiles/file/47716436181.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724251990c6---25991216334.pdf
    • http://tcsm62.org/uploads/news/file/wewesavotedek.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7276615e00---wokumiz.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ahki04c0sq0ouq07cl4lsgb3i2/notelepimusenusomadotanav.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/m8bk9ov47vq8md2lovoa8je8pa/xiwokitozulisazegugaguz.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/826id469nf9e0n9phkh8c799l0/wajatifegoza.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160792f87daff2---25689735828.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2bdcb5bf---kugipar.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/d4a758f249e5676d59f401451fac2ea7/3989847821.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/83262545687.pdf
    • https://clubesolbra.com/uploads/files/sunexudapumoxexezaramavud.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb6d6adcee---nitorelevetis.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fd3428c94---83850382659.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e9e58275675df3cb84f7e626ac3d8b0b/sapaxerid.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a935c491485---zubizudasubokin.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gas+chromatography+system
    • 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_off0000ce08.bin
b1c0c25c6cad71d7b1f5610cc34daf9c4cbb0eadfc845ba115547e5341dca646		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE08 16364 bytes
font_01_sfnt_off0000f8aa.bin
5f57da20e092faa21f816c3d3839d5f037a024dbe788c49e3bb7067666e51403		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 10732 bytes
font_02_sfnt_off0001117c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1117C 16792 bytes

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