Malicious PDF — malware analysis report

Static analysis result for SHA-256 87737d71f47b2805…

MALICIOUS

PDF

96.5 KB Created: 2021-07-01 12:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 90e9212926769a680673951f6366288b SHA-1: a09c2d4414f5cfe73efc538ca669c81b99323f15 SHA-256: 87737d71f47b28053854abe6cf420d45a5fef5ba06440a7076428f7f88de0e12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2d525dromeuod6i6378o6t57n4/rupokuperopowerudexup.pdf In PDF document text
    • http://kingtonkatsu.com/uploads/files/zarisegufepegewagefinuje.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/galuxukifutemunek.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3fa990610---42534145536.pdfIn PDF document text
    • https://superpart.com/files/levojiw.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/28108839186.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/88433983953.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/duwufeniza.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/jafukuzukoxixabivivi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160728004118b8---56077954953.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/76278e4752154817d3427b7d080dd85d/kelawovikimajuwokoto.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/temorukiwitifimakazemola.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/44943196831.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/tevujexoju.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d8ce962afbc5466ba26975fafc5ed425/ditunob.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160ce81cb3f43c---dedexubonodito.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/lijiwiliwidijujizup.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/wuridelamanaki.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/28820468330.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160820d954d891---79625545931.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606d399ea9f93---64436841996.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/80580943593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=easy+rhubarb+compotePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001153c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 17956 bytes
SHA-256: bee7db870008f3677ce5cfdda1ded55ee00c6f3f012119da03bfb9d7659383d5
font_02_sfnt_off00014412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14412 16392 bytes
SHA-256: e9a704d00dd6e8ff808373eafce3a9164bafc01e3896b7f7a96cfc50231b2c9e
font_03_sfnt_off00015a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A43 10736 bytes
SHA-256: 28e8452c6fb9e8eebfeeba8c85e0134bfb2f68efa4364205269bcd3fba0dcdfc

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