Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3772646371c515…

MALICIOUS

PDF

83.9 KB Created: 2021-09-12 12:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b761668bdf8100b9dfb653087f0ba713 SHA-1: c9d6b6c6c0ea21a158daa3015093b171948d7743 SHA-256: ba3772646371c5154307c2d947c8adb7da4508bcf1939fea66eb0bac7c546f26
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, some hosted on compromised WordPress sites, suggests it is designed to exploit vulnerabilities or trick users into downloading further malware. The document body, though heavily obfuscated, contains metadata from wkhtmltopdf, indicating it was likely generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://colorsoftexas.com/ckfinder/userfiles/uploads/27711863935.pdf In PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a7b7b00250906443a1bbf9e21fa9069c/rabitomonilegonipu.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210903064437.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/rujedaxuxobipofik.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/21258694482.pdfIn PDF document text
    • https://comfort8889.com/upload/files/dimovojudomov.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9e2276b610c8655d4498d363f029d467/90943104186.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/linovigofivi.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/77035867898.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/tufox.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/10278646790.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/14823326185.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/jubarimixovu.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/xapinuru.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/97043045796.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/jogutaratog.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f17be11287---ropigazozenide.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/8127050139.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/71565938406.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/vokavexotugexolip.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/4649934928.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/zoxuz.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109050747497691.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/36076856670.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/58735650155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=world+cricket+battle+mod+apk+android+1PDF 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_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 10784 bytes
SHA-256: 18e65d16841d746a2f4c20bc4bf7544ea522f940426863f5299d4f4a636ac97b
font_01_sfnt_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 17732 bytes
SHA-256: 44ab4db4998444a1d9953dac01a1cde8a0740aa8bc62c3275dd509ddde5df3c5
font_02_sfnt_off00012964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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