Malicious PDF — malware analysis report

Static analysis result for SHA-256 911fdc3431f0b59d…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 21:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bceb5803e5441e500b2aef549a271829 SHA-1: e66879aa835d189dcfd25f492f77e65df35c1062 SHA-256: 911fdc3431f0b59d4c7e85907ff5e9b6b9284db06f875bbaceb73d4547eab4ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://behagi.eus/files/galeria/files/xokunimajuparitamonip.pdf In PDF document text
    • http://servis-hradec.cz/files/file/9598034452.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/5323724081.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/wumowepinidovawexuzujanur.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/om72r73j9950tqad3u4dg53pdp/2152095472.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb31ed9bc1648244c02fac086f377b3b/xoliwixinefeg.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072c2d6549d1---8578968158.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/73094560150.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/winugatetojilifomo.pdfIn PDF document text
    • http://fgosvo.ru/files/files/63417207742.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/dezokufarosar.pdfIn PDF document text
    • http://proart.by/media/file/jifelikixuxiwakek.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/gununosadusaxilix.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/62792878731.pdfIn PDF document text
    • http://centrons.com/uploaded/file/209315995260d2cb9e28e41.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/36298259401.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/dixijojukenedufi.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/795c61c027e27f619eceb796b59e9e66/11502627746.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/pesiked.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/88f6b91ae3815611f5f823a112fd4bcb/97044197595.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210726005734.pdfIn PDF document text
    • http://falerisztika.hu/tmp/85721286161.pdfIn PDF document text
    • https://thepainter.asia/upload/files/vijudere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=complementary+angles+worksheets+grade+7PDF 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_off0000d0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 11120 bytes
SHA-256: 33c157b8617038b141bf14a19d71a4e0a45f33dd19a6db4fdfd2de1fbd305dfa
font_01_sfnt_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 17736 bytes
SHA-256: 6e77b3bfc0db25855b7258e63b01a5cd4f68f684e75d0e2be22912d9a82eb8c2

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