Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4b53ea7745d6a5…

MALICIOUS

PDF

89.5 KB Created: 2021-07-18 14:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ded9c40b3cbe61d4cbcb82ff743a876b SHA-1: 86899bfc9c7f619051d4d45eddd38ca2ecb6f4ff SHA-256: ee4b53ea7745d6a5281f14141babe0b125853e3e14bfc75f97dd6f4b275c5b7b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these compromised hosts. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b98412c1bb5---tokoxofisiwowipewinibi.pdf In PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/1e8deaf2e40c8f2f209506adbecd3fa1/20479872053.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e60a0d66ce---15577288601.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ef0718487e675b2a6b6c5de2cbad7ba0/63491550130.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/44020861951.pdfIn PDF document text
    • http://lucann.com/Upload/file/74523975457.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/gimuwiwagapajapezize.pdfIn PDF document text
    • https://tipresentoio.it/images/file/kojelugijawenemuri.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/salamovozokid.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/vemobibasaroxabo.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/id3fpruft56tl2brn3mvplqni6/gavosixogaxanowekem.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/lozonomoxiri.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/senubogada.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/nozuxozadaginilalatomuge.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fb4452366---nunugafa.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41ebbde35---87394053449.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/211527c7c787de0ae6c91d85adb37f17/bonuwixov.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1976c6d1e2---92213130905.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/739e526ce033bda65bdcaf1df8220e4f/32847146260.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/dupoma.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/nurarajuforomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=first+cry+franchisePDF 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_off0000f9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 18076 bytes
SHA-256: 3439089c243c9cb99d1343c46c6aa4d4e35cb43dde3f3bf0ea7c8e83ba8d29f9
font_01_sfnt_off000129fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FA 10360 bytes
SHA-256: 2aab69549710a5c8309db4dae2f8705b0bb81f0ffcf20be2965dcd9d3ae487ff
font_02_sfnt_off00014154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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