Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b29e66024ea61a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-06 01:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e4dd82a55c555567864193a9d26d419 SHA-1: cc42d1c0eedd1e3901f5c5593f985b0c4be40cba SHA-256: 87b29e66024ea61a9064a7cbe0e66b226ce02a39f99f744a2106fbf92197f717
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating that these links point to compromised CMS upload storage and are part of a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or to distribute further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://reafamily.lt/ckfinder/userfiles/files/gigetepigu.pdf In PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/78724657729.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/davozojige.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/c88049372c666aa03ae9a1457d576660/62706595337.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/xewalenipawodawiliz.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085489e57ac8---kolerinanebadokivo.pdfIn PDF document text
    • http://innotack.com/userfiles/files/53819742282.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4ikf86g13bu1egilv2i4ge8fa4/sobogefa.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/21e86f7119a81bcd19c1b1ad0f84560c/lewaro.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/xasidubodezofup.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/62394719093.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/zapaxufe.pdfIn PDF document text
    • http://fitviewer.biz/files/file/37771865215.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/0dfc787677ebdb77d8cf977dd39008d3/lafosozotikowatumuvim.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3842069ab6---44521567754.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/94824663997.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612812bfc519c---temejusajodotam.pdfIn PDF document text
    • http://pvvc.cz/files/bopisivo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f84abf2110---mawugifadupinavu.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/jenumi.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/fagaxezafujekazixux.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091b5c897a85---56501362163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hatchet+vocabulary+list+pdfPDF link annotation
    • 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_off0000b511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 15424 bytes
SHA-256: 5a161d304d744eab3199e196ac05d4ec1e49b468313c47f2bf7b3dafcd86a591
font_02_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 11024 bytes
SHA-256: c808110393256e0ad5020784a80db390477f9b152453b29c197ee25c3687ec73

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