Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fe8df4c4edc7a8…

MALICIOUS

PDF

87.1 KB Created: 2021-08-15 02:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 8d4101a14b717c97a6387969bf1571e2 SHA-1: 44ba98e8ede8dc662ab92942df5815cbb8365eaa SHA-256: 12fe8df4c4edc7a80065896081dcb7f5d931b0100cc2b144d15c104d3771493b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://catamma.ru/uplcv?utm_term=krunker+io+all+skins+hack PDF link annotation
    • http://clairvoyantinfotech.com/demo/images/kowafubenanivixizazi.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084abb014b55---38106055657.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/84399639464.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/16061442283.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/bopidulufidewiwisevexo.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210625032736.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b7bc3c173---89435056351.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/bd56t1hv0s0uciu1utsak3gvt4/92634041474.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/98115130d1f04e12f46638adcbd1f5b9/kivawukozorobem.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/47332379852.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/10412671053.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/xemiv.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/9ad2d95c1f50139b9285d1a05b1bdbdd/vuzogowokudo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3f780dca5---70825025586.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/19467818462.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/37481996507.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1cec011cec142d552e2a0e45c18281ed/82548387419.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee657f0c4e---resevako.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b1962ec89e4f55a975a08eab4f72fdae/rivegitupoxofemeb.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/53514497850.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/89901378674.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/71325281500.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/lurupavatodo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 10412 bytes
SHA-256: ee48b312429b8eca85ab6b0b232f207651bba859b322c6abc6b3df576ca05da7
font_01_sfnt_off000109db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 16908 bytes
SHA-256: f2081640cf66ad9d5799fe0a16400ec8c2f7d39bb590797a86d2681b7b1f0087
font_02_sfnt_off00013632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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