Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc359e646e77622…

MALICIOUS

PDF

84.4 KB Created: 2021-10-06 06:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f3c212425d2aeee05450020dea9f3ab2 SHA-1: 15b40318ce0efc2bbfb6fd0b320eb0e29e6940e4 SHA-256: 0dc359e646e7762221215eecc22617de5cc3f07af17adabf838f0ffa85e37e49
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised or disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://sallytour.com/FileData/ckfinder/files/20210901_A3B192FC19295741.pdf In PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/zeduf.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/tedoxebijivugu.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/gtofi0vjvgd88m9mq7le0upbt7/rupemakusilizof.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16155950b4c9c5---80166613929.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/fidavafudunagujaf.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/siduzefafezan.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/buliloriliw.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/81210436880.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/dewifidaviwit.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/tadenilivuposo.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/73202132587.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/66049094365.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/3dc5bdfb442742e8f6e9cb124cc0af2b/pomufadoxepatepekimubi.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/nuxowesureferukoweleti.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614093eb06f9b---73875989419.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/wemivutezegoxituvereroron.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1615cdb4913d52---zodozedorumivin.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/4787070482.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/zujun.pdfIn PDF document text
    • https://dhesient.com/media/wideletux.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/4586672198.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/gasagutalix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ap+human+geography+religion+test+answersPDF link annotation
    • 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_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 10980 bytes
SHA-256: f49a1a7f14c43dc9bccf1dd09da6668222f5b5aaec2bcdc4d14597a6aebfc1df
font_02_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 17116 bytes
SHA-256: 477e7b14898045273b22e8e24b8e5571fcdbaf525d686710a56c6f580dd1bfd5