Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d83139a47f1ba9…

MALICIOUS

PDF

85.5 KB Created: 2021-09-06 20:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 396663d1837cd9fbd993ce1ec2152418 SHA-1: e039eb667a3fcccad36ae38a6029f43b49159d0e SHA-256: 61d83139a47f1ba9885e8104f9ea250d24fa517beb6af9081d60309044f453c5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the URL structure and heuristic firings are sufficient to infer a malicious redirection pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=corpuls+cpr+user+manual PDF link annotation
    • http://flexa.cz/docs/file/20306406457.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/turuzewid.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f597f2088a---matabixifoxeduzof.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/8f0f815ebaa84381f009314767676a34/34327726726.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/wasizorizovijef.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2461b8f61---17584416262.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/39289403963.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/15942466775.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/zuxidodofazuginuzon.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160974403cf825---91610650947.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/sazikagidepexowezafus.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/segamokajotetin.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/zovidefikelimomovuman.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/68794364241.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/41037651375.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/97623579448.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bba6a6c29eb---17554810798.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/53362389764.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088e60e269fa---nugogitivufipuwibe.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/86269539307.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/iqj08a0ch4n12l3r800u9pphr7/sulanupi.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/8329602068.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/96glukbusbsal4tn47re0aj0j4/resatujepofevonovu.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/17016664223.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_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 10476 bytes
SHA-256: ec249b2561243bac75f8f283af6d18d6f27aa067d7b13ef82acf85ba5d23b34b
font_01_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 17888 bytes
SHA-256: 9acf97954210b5ba59519b41508889d20d96a8e49f19f277cfa5f5347c6f3ef1
font_02_sfnt_off00013067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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