Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1a214cad430e7c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-02 04:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7272a7ea429a853ae8fc8efabe5b9db6 SHA-1: e7508d8ac3c245447ea05b6aa283f2df9e991d8f SHA-256: 9d1a214cad430e7c9d6c9b408b8e718b8a6d055eb568a8d94958ea8f128dad90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=aries+personality+traits PDF link annotation
    • http://namthangbasaltstone.com/uploads/image/files/89994250336.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/935b1227e115e8f293e537c3a38d3355/vogefozonowaguxej.pdfIn PDF document text
    • http://markone-tools.com/upload/files/muzodajeredugudomape.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/guxevizapoganivukijeni.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/pekomikarojituduge.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/55464331210.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ad8e0bea0747fc680de09b0b6b89e374/bobalawokuwuto.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210629_011825.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/ripemuv.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/74823847478.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebce43151f---8608680429.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/wivoxanumejumuduxivosi.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/rakenobot.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160928d323f284---48136471698.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/zitop.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/44042947363.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/bomipubafilovemivedipam.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756c0503288---5391493184.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/11203306726.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1765ed5dcc08ce400358967a859ba310/91254359053.pdfIn PDF document text
    • http://usa-ex.com/images/blog//file/32638287408.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_off0000b57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57C 10340 bytes
SHA-256: a941ebf2255a4772aed03f0b476c7658241fada720446126d2988eee3a7e557b
font_01_sfnt_off0000ccf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF9 15872 bytes
SHA-256: d2aabf9ec001dc489c9fbd70c874a17665f80a2b4801be53b50eb72b5c9df759
font_02_sfnt_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1