Malicious PDF — malware analysis report

Static analysis result for SHA-256 8272aeee9c0b0473…

MALICIOUS

PDF

71.6 KB Created: 2021-09-22 19:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 470da537ffbf6c9ed2dee740a2ad04f5 SHA-1: 26e880810776f96a4732c1b3fb6b77f94404d0e8 SHA-256: 8272aeee9c0b0473b45d6f579e953709bced646af01e717a3b2d7c5a09183dad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=how+to+stretch+an+image+on+android PDF link annotation
    • http://khachsanmyngoc.com/upload/files/pebovonovelotogezer.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///15014759658.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/dugoxidonojozeg.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/93524151797.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/86307872203.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/kizegufipetejuv.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f47c9cb4---55343824680.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/92010894492.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/50618096212.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/lidokisi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eed62d0c3---ridomubawubu.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/sawup.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109152005528161.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143868526e5d---27289138680.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/lefuzobaf.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/2430142003.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/89948413604.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/gituwogabosov.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/38110752201.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/57031592152.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/4735533253.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/wotuminozanelikezup.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_off0000b66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66B 16268 bytes
SHA-256: 81c17d69c6a7d6952ed70d8068f2da038920736d1713d107770f74ac7f38ae4c
font_01_sfnt_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 10848 bytes
SHA-256: f1f2f9f185b6d25dc2bce9bbdb878aa3992171283c0aef07918395d87b26afaa
font_02_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1