Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73fb91735a68fd7…

MALICIOUS

PDF

87.7 KB Created: 2021-07-03 16:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2eb50a04818270fc1cf23ed5433b41ce SHA-1: 73e530af3215f201ae4fe324afb58941c144eef6 SHA-256: e73fb91735a68fd7f0b9a67685bee5b05e4fcdd3636d9728676415586126df3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/871edb68bfc714b5bcc93a235370001b/lijizuwijifila.pdf In PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/69342eb2ef173ec0b3a06632dfd3aecd/41212568065.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/sjpnng3g0bon41kc2rk431sat7/bugisevugasutipu.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/4q47c2tufvjips4ra975abo822/pazuwopozukepikuk.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ca18f18d7c8f91faa4203631a461b1c7/jozuf.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/pokenosifaporubuvewob.pdfIn PDF document text
    • https://red-adlay.com/upload/files/tenafezudux.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/nivipowoxusovilo.pdfIn PDF document text
    • http://imaginove.eu/data/Files/70501351895.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd05833a88---28506617319.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8694cc653908e5a7168eb4f8e93b6bfc/18552619160.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4372d0e0f549467ffbf972f206057ab1/57136145751.pdfIn PDF document text
    • https://tavio.ru/files/file/dudorudilebepizoleno.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/wakudaxakikebo.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/xaneferuzuso.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2hi3op7f305uns40lpurvfc5ls/61428423615.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6ba6ac2f4---jadikifemo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2fae4bdb---dixum.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/99570462269.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ab01226ee62c22bf92e852ae0291af92/4080521328.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/644589e37e622af6b1141067d7ebd78e/52248169915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+a+co+signer+off+car+loanPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6f6fdbd0c21ea5097404a023767b3732/dixipopeb.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_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 16436 bytes
SHA-256: eef194ca5e288af5db04d0e9c884d1c7012266444ff7ab432e8aa21bb8d1a9f6
font_02_sfnt_off00013949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13949 10588 bytes
SHA-256: 3517f16c1a9625b33dba7e53cc8afd68a45eb2f726517ac5b3c3f0a1d32297e2

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