Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83347e0902cfb59…

MALICIOUS

PDF

157.7 KB Created: 2021-07-06 23:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b7ab88dffb3468a4b540363effe27e78 SHA-1: bd21c588ed02b552700b5c8d198b244308ed5091 SHA-256: a83347e0902cfb5985b40d2cb68b1c7bdf4aaed16cf206dc28e00599cc9735ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to various websites, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://wastran.ru/uplcv?utm_term=reflections+of+a+man+download+pdf PDF link annotation
    • http://indago-rovigo.it/userfiles/files/nigexagusuzezekabogalez.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/kikefosikifuzijej.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/b60640e7031f210d233403ed70382da0/leminakitak.pdfIn PDF document text
    • http://446888.top/userfiles/file/61186947982.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/91045947086.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0aab6bca46277dfafe6b8dd6d249a6c8/96369132229.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/cd5342ea96108e0b9d8b72436f395e76/pugekudodari.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/13f974379d2d4f0bfe5c87f8da4e7b29/14512726988.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160795a2a02f5c---kepipolomoxuxajivivanuraz.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/42748850817.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fa2b2173e802e29a33034c27f31dc8b4/66788673509.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/ruzenevaseba.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0afd86aae---jajelubanagefogab.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/aupbvbogtguqlu1hkc75rf5i3u/43007104786.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/dul6u36chdmuc9r5el78ojuq84/depolar.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/427af37d8c738b8530717efecf06c9ad/56468501566.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/6c20ed51741c68aefb678855c3fc00b6/59404222630.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e05960961dc---67810218816.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/livogenexikebos.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf4ee46a9---wakavevol.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/7260471e19b980b7960974ba877f3980/xutukefa.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/549e1cd748b955cd3789d8c074dfc979/tenikazawazig.pdfIn PDF document text
    • https://tavio.ru/files/file/29092423858.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/17266173344.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098dcb42a420---wowizuvevate.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_off00020856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20856 18592 bytes
SHA-256: 9dba88a88f0bc7b33fb232567ed94facc0a5899acf4ea396d18f6790647da633
font_01_sfnt_off000237fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x237FE 10812 bytes
SHA-256: 264ba8b93b8209999e3ba6e08a49c701377574de997dc1ea56b9d6672b0d5278
font_02_sfnt_off000250fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x250FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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