Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a006a81e2ba9ed5…

MALICIOUS

PDF

112.1 KB Created: 2021-09-05 19:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: efd326d9f473a44432b86855f40c48a9 SHA-1: 422ae863f4df02bae9cf638c093155b328006973 SHA-256: 5a006a81e2ba9ed54216c8cef2d86279ba782cc069231c19842a57b1e7a91429
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted from this sample, but the presence of a link farm is sufficient evidence of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6305

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crewmak.ru/uplcv?utm_term=plan+comptable+pdf+syscoa PDF link annotation
    • http://ahxxzx.com/userfiles/202105/file/pizafi.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607259fdb2a5f---8640090657.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/87636340267.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1611d8fd07d93c---7893694797.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/poluvipatav.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/12256185565.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/tpe7v0r5hm6m28g9v18v02hm8h/81263764070.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d10dc467b---bubenumexavekotetapa.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/36629978924.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/siraxilonojamejine.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/dd958206f27cb859c616b3e8c711e4e3/mawiwixaneduj.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/duxufarufumeneromigekekot.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ebefd6081---62233527644.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba867d07fd---87286930668.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hv9a41797dv3vfaqi6hmiehgq5/38583591180.pdfIn PDF document text
    • https://majubesar.org/contents/files/tesafejoximakamutosamul.pdfIn PDF document text
    • https://moolans.com/uploads/files/mibaf.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/60c62fc3f2ba19d53712b10e8a9d026d/72680790726.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/kanaw.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/99105343964.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5l017msjv2kvs2q2ihedsd9qmf/2203079801.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/lovosim.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/jotenekumemukim.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/1b683a1e86a10703daf90a6bc1e88eeb/78452335160.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/xumepabujobixominusewol.pdfIn 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_off0001593a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001714c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1714C 19628 bytes
SHA-256: 448868dd62184c35e83d6262c0ac1a2412956e37bd745f4fd7d7b551bf704bf9
font_02_sfnt_off0001a3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3CE 10844 bytes
SHA-256: e8c3c057fd1ce8449bba570f97162d1613641411dbabe84f3e6a87a7b3dd30d2