Malicious PDF — malware analysis report

Static analysis result for SHA-256 b950fb942bc3b2ed…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 04:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d92cf9d6646732444174523a12c15641 SHA-1: 4e055210a29cf2fffecfaa50836624f92c6ea763 SHA-256: b950fb942bc3b2ed6bfbbe100b5265a16306d0419f06186e2d24f908fb0694d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to act as a lure for external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=maskgun+mod+apk+latest+version PDF link annotation
    • http://taiwan-tsai.com/upload/files/73433578061.pdfIn PDF document text
    • http://handgun.ee/media/file/62565260486.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/mubomuzetugelonegogenu.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109050701092668.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/pawib.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/xajupivar.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/31117258833.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/75885168796.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/42241851257.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210916091335.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402d52d1dc6---tixulusalitunobaxesefima.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2cb870ed8484e9d2bc7e3f1428aea712/kusuzemoguluroko.pdfIn PDF document text
    • http://hibertek.com/image/files/20210902_050055.pdfIn PDF document text
    • http://risme.vn/files/tevizaxaxilevap.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/14810177483.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/11439353558.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4cddf37b9---lonupixipuruziz.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/tojixavofase.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd77ab212e---64724812606.pdfIn PDF document text
    • http://rem-proekt.com/f/file/wolarewupatabotemimu.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/31599516824.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/komofezaserejozudiriti.pdfIn PDF document text
    • http://htwy.com/upload/file/dafanazivogap.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/modoferepegogif.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/vuxofinagigivotop.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_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 17764 bytes
SHA-256: f4c35c4b0bec3e610ce67eb3e75fa23236e8811ecb5659e825a3bd6f933a7ed4
font_01_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 10984 bytes
SHA-256: 7ef4599c6d1b1486d10800825a2c9b01063023de498ebdb7a45fefe7eaffec0a
font_02_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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