Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c24e0c70f2f019…

MALICIOUS

PDF

86.0 KB Created: 2021-06-28 03:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fc22400d94e27c2c96ad43f50123e82 SHA-1: 46d2ebdfe8e8401bb10d6bf5fafe1beedf872894 SHA-256: 98c24e0c70f2f0196ba8be58e34c65ae0741e3d67a941b9334833738e3b891a8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The primary goal seems to be directing users to external sites, potentially for phishing or malware distribution, as suggested by the 'link farm' and 'phishing' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://giaoducvietnamtv.com/images/ckeditor/files/82171470855.pdf
    • http://beerskiboot.de/img/upload/file/87613193568.pdf
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/70247936808.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608283e06c101---tepuralaj.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/ce8f2caa54248b696070ef1c3870e47f/88557574696.pdf
    • http://karthikeyanjayaram.com/userfiles/file/98195221262.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4886b0c30---22349453757.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/2b6f1cff1ffae2333cc25a6b395e3308/90325869729.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/60f2eq4acl7o87u0k03d8eb0v7/40670875925.pdf
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/60376743692.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7716ad6c2---zepivaluroganoba.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/77edb2c35bf48c370a1583759ac77523/93930125436.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608610ebf191d---55966710000.pdf
    • https://contabil-fiscal.ro/mm/file/zopebiderimakuf.pdf
    • https://bozoklar.org/ckfinder/userfiles/files/murol.pdf
    • https://northwestconvention.cz/data/files/59252307674.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f5e5be23---beguvux.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82cdd2de9f---74044804575.pdf
    • http://zhengfutz.com/v15/Upload/file/2021611058576908.pdf
    • http://folientastaturen.pl/_data/file/84044618906.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e58afbee8d---tivesuniwezenanovo.pdf
    • http://musicpark-live.de/userfiles/file/tanenuna.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160877eb121e65---girukanaxogelubivofuxid.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/chlmn2emmrho57f4htfnvqeds3/74004611106.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=3ds+max+2016+product+key+crack
    • 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_off0000eb7f.bin
c10bc0bc6bedcc934f569ed6692c3359a51bcb7c0af4b6998d6753359bdc708d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 16972 bytes
font_01_sfnt_off00011788.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11788 16792 bytes
font_02_sfnt_off00012f9f.bin
5f0733982413c36d3555bd6ac25c7c16214e7ae9dc8ef4d57a4dd24e65c0724a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9F 11376 bytes