Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f0ff51e9274e01…

MALICIOUS

PDF

73.9 KB Created: 2021-09-09 00:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 710ef280525360d345f2c6552e092294 SHA-1: 8d7641dffad31817a79ef94dff95619c4eb89bec SHA-256: 97f0ff51e9274e0176793c8a517967d355ad17c8729003cf2281b7343af0a72e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://pixomot.ru/uplcv?utm_term=the+purge+3+123movies PDF link annotation
    • http://sasolution.kr/userfiles/file/92107484356.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/4654938684.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/33818673543.pdfIn PDF document text
    • https://electroagro.es/pub/files/29606442075.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/fg6prchbqhtl2mv5ktrfnkpoc9/98461769752.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecd108e78---kufalufaxuvixubonomifim.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/18822943706.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37143856017.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/datetumekozege.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/zurotejojexez.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/mepenazisenidaf.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/tudagojazuri.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613870efc8c25---22245011176.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/66120015437.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/bixewipomagov.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e3749a03---21870691390.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/69777780750.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/90868695464.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/pomejuwibeneperix.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/murawozopeb.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323b161a080---furobewaguzuzuzod.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358ae366d11---41026510538.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/11455882651.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://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_off0000bec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC3 10760 bytes
SHA-256: bcbd4f9519437772ad041762364649af319f935284dfe9ecbe1686555f5460a9
font_01_sfnt_off0000d7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 17580 bytes
SHA-256: 2cd324e67a7183fad7a8e651166faaedefa107c6b3de24479e68036e617502ff
font_02_sfnt_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1