Malicious PDF — malware analysis report

Static analysis result for SHA-256 209753f00c3d171b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 08:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 11dcc9d5b8537891071ba41de15ff0bd SHA-1: 01508558476d7049d4f889b5f4e6166b5196abf6 SHA-256: 209753f00c3d171b67fb538b712cb6238b1e46c3de2315dfb778144aaa7cd0ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=where+to+get+cut+in+pokemon+ruby PDF link annotation
    • https://happycondo.leaddeehub.com/userfiles/files/fugar.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-04-13-07-42-50.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/notum.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/vuzorajedadebefefoxexege.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/32235881546.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210902044913_d1eaik.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/7qbj63vdhc617i9p0j5uutm0d4/83125681614.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/52782863131.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/xipiwanidodudulexegojegid.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/fifexid.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614025515a83e---82942691851.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/naxikapusumexesazum.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/xopuvotuzulomuvapoxuz.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/dunegozoke.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/povumawiwazazukatubavor.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/49903589035.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/93074449268.pdfIn PDF document text
    • https://o-dance.com/upload/files/rexadepizenum.pdfIn PDF document text
    • https://majubesar.info/contents/files/78292657156.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/84684362112.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/fipopatipaj.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19a42f58c---38336001581.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/fanolefusiminipozupavupu.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/gezos.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_off0000bf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8C 16376 bytes
SHA-256: 948c91c60beb0c2b136a09ac58e57e7c579d91708a3b8e23bebb1460e2e131e5
font_01_sfnt_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 10884 bytes
SHA-256: 310560652cdbaa7c3d4531b9226af79635b3609ac9f7805d18bdb1db110fef4b

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