Malicious PDF — malware analysis report

Static analysis result for SHA-256 23af4a4fbd40867a…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 00:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9d5b5a5b83743b3ea7e4d7e4dd57ee7 SHA-1: 166c30ad7c10d336aa7216b3cbf6f0935083dcbf SHA-256: 23af4a4fbd40867a979d497eb164831f57e2f822e5b77fce808f60ef1506b3bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://istanajpdua.com/contents//files/wezuderapuxuditavexu.pdf In PDF document text
    • https://daynexweb.com/upload/ckfinder/files/56826184882.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/binufikexepafu.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160f3bcd2b05aa---91589723562.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/64250527577.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/sutebegirisukidud.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e375f30a---84288939943.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/28328337273.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/fpoakag87fme5jiffjisub7q60/jabogemugemulalopinitob.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/83750774151.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/xijazogiratezunakasor.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/11119458787.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/gesejax.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/8676714667.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160884bce94468---wojofawuxugobedozu.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/4792001981.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/j3nc9hjfsn7phhs59o6s8un1u5/rikevex.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c260e9801---96441524760.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/gapegixedoxiwude.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/caim56ki846n6r9bvr7v35to70/85315366099.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/vagujakowole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lesson+1+skills+practice+circumferencePDF 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_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 17592 bytes
SHA-256: 6fedc2bcdafb38f6645a483bec660c5bdbcc9b65d47c977ba79d83f92a53cbd0
font_01_sfnt_off000113ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 10840 bytes
SHA-256: 510e12a7f506a716089c7b11b9bad53b6cff86341691a1ac565f00b82b65579e
font_02_sfnt_off00012cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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