Malicious PDF — malware analysis report

Static analysis result for SHA-256 de859cb5deea2860…

MALICIOUS

PDF

89.3 KB Created: 2021-07-24 15:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3999615f2221a63e4308b099268e8f3 SHA-1: 2b8f3f55f08849a579bca0507c6f206257bbf715 SHA-256: de859cb5deea2860cf7306b6498cf000ae95bc104b87024f1a084dbff161833f
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. Heuristics identified it as a PDF link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 http://flatadministration.com/uploades/fckeditorfile/26982090696.pdf In PDF document text
    • https://soft-print.pl/app/webroot/media/files/wizugawudugikenepipika.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/73264827453.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/naglgeo5t4qt9b73m2kkud43gr/47761310576.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210706180106.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b42341f63---fixasakozalafe.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16073b3e8bd0b0---35498160177.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/jimamalazefesovuzona.pdfIn PDF document text
    • http://praguetransfer.com/files/file/91959090361.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/36138644442.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202166736349343.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608880019af95---41143280876.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210502023540_1081554349.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/posugepuki.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073104811717---vigorusapojepomarubuzovas.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210517180654210695660.pdfIn PDF document text
    • http://altinay-law.com/images/file/gejazejoni.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160886fb164173---wupaneresadutipusosanaf.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/nanipumututavel.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078b76ebc002---27950135408.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc66cac657---gununoxijiribodep.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/avdc6li2rh6aqrulbr7bot86ib/tesowuzewuxusajegigo.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/nafaleka.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ea638d502---pejefewowegujerowiw.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/14ee1178ee64cec557356116d1102ce9/4742296053.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bacfede85---ragegusenenof.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/sorijar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=le+pouvoir+du+moment+pr%C3%A9sent+eckhart+tolle+pdfPDF 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_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 18724 bytes
SHA-256: 16e201a269a2a19b493dff49acc72b52ff88064a9757d65aa11b3b07bfaff449
font_01_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 11256 bytes
SHA-256: d12b0c7b92afb0515740994b5e02473761dc353061c62668ffce5a2829967ee1
font_02_sfnt_off00013b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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