Malicious PDF — malware analysis report

Static analysis result for SHA-256 129d6b309be56ec9…

MALICIOUS

PDF

78.0 KB Created: 2021-08-26 16:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f5abf608f9398ce2fa39f878a95e7c8 SHA-1: 62c76811f752faa94e9a05acfc058366cb007d2a SHA-256: 129d6b309be56ec9f3445b24668aebcf65679731fcb094a4a7fe3b7afe4c9923
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to lure users to malicious content. The presence of numerous unknown URLs further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727578a0432---xotupobexilujas.pdf In PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/03b64b7686b8b2386d724aef1166d160/zolekiraxodubifujojab.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/19046139856.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df286d35f1---88075300430.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/66558543010.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/71446266892.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/96929183819.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/52763413705.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a78f333a9ea---fipituvofizi.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/lakajawavurokusaxe.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f50beaa2f3---lepowufutome.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/cff5c6c234a4f6e432b83e7b7d2ad982/rakuzarom.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/918a66223059a4bade7ce2e4fe4fa489/suxukojamasukodexop.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4499dd4c177afd73981c96314bc29d9e/3824812803.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/97349927462.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/suvakexawetumaw.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/tipozexobejaxisiwin.pdfIn PDF document text
    • http://chipgene.com/image/files/20210818_034407.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/87114156669.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a93e349d5f96a8ce3f0e964bd43075cb/fonifipojobigovupebabujim.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/83402209217.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/aeeb503751310f4e85add6bc78f498c2/jibuke.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/cbe3d21a2e71904b9a43b464c69e298d/kefutapejenet.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/wukovipunaxipirupasexuj.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/58226285058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=in+deadly+combatPDF 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_off0000cfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEC 16376 bytes
SHA-256: 02b3a438897e3bba92d01fb19c6c8c51f1a66e73abc053d161ccd6030c44a84d
font_01_sfnt_off0000fa39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11250 10376 bytes
SHA-256: ca36425ea610dea3327225ac5cd1db0938175605a5c1188ff6ed1080031fc6f8