Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8ddcfd2bc24341…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 09:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e83c07a55daa7e563843aba311242fd7 SHA-1: e5e9035af08c7effa9a252b85ce086314167f50e SHA-256: fb8ddcfd2bc2434132d5e8ef3f6edeb37dcf3fc599c9f20bcc94efce25a663d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=lost+river+campground PDF link annotation
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5ce078f34e142ad1d7734e15f3c1d11d/xufopakidewajixemejo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13318bcf00---1034745425.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0b20291c---fofevavupiwexisovadow.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/13799598838.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ce63cc508---30074163429.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0686916f8---29297371830.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/vikawilugigibagavilut.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/1cbb6ed876a784127700c0571c8669cf/47042834479.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/zubirejasitojaxiguwu.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/16886006711.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/18769100258.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3b1e74fd3---58451124929.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/rujuruwojenoli.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jt64aviena9o84bfke9cb97i7l/16834177260.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/dewuriku.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/12980778127.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20216925948.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2dce9ceb9---6956667357.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/33708627067.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_off0000bb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB27 18356 bytes
SHA-256: 90fa6452da25f04cc3840d078755594bc82699f6406605e7029246c34de94dec
font_01_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 10936 bytes
SHA-256: 30a612566b3f31c3df866d888bad888cbdd7ef98f829e07e08c787730fb8f89b
font_02_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1