Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3e58b3e1a9d0fd…

MALICIOUS

PDF

89.7 KB Created: 2021-07-09 09:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9f1eb06ba07f3fbcb5831dfb787c8b3c SHA-1: 787477f55a6c378ba1fe6e0d90fc1a29e544cf1e SHA-256: dc3e58b3e1a9d0fd8dc5b7906b390dc8ceab41d6731de8eaae20afbdda2a0148
164 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. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host and distribute further malicious content. The presence of these links and the overall structure strongly suggest an attempt to trick users into downloading malware, likely through a phishing or social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076202102b75---mimanisuvigoxil.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c0d8ad73b22c5af0ffeb0097ba790260/52776209935.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb5d5e62c---mutanopixozanutibejaf.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878b18989ab---75952294857.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/65185652329.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607857d18c07c---26578334854.pdfIn PDF document text
    • http://bdn10.cz/files/file/35097024933.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef6d59710---vivizixipodeluze.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/vsu64039gd8827ue31j88pnun6/takokerunuselifokefubute.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/91563305143.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/003e7a6576d02069020934bd1c0c7019/68512063819.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/xagelawurajoxuwizuzag.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bebenapebesut.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/xifozizagasimo.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/tu2j6q2stkss7frdblec6eib4n/radibagupimeto.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc4291b01d---saburof.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/nhnco70lbtc0l3g8tqmetmpfh0/43998436207.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/61030183664.pdfIn PDF document text
    • http://tencanpowder.com/d/files/luvafigatovizopitedubox.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe70a0d726---disekanekosexelekukiwama.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/2e80d9dc4dd57e3a473b68bbb7f95e1b/joripolor.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3e51f17e8---98616698514.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/29/file/20210529_015722_139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nta+net+management+study+material+pdfPDF 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_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E3 17120 bytes
SHA-256: d8a18e0e0ca38f9071ef81cc92b2bfad1e7a14e8bb8ee384bd9bc0b206a43f67
font_02_sfnt_off000140a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A1 10912 bytes
SHA-256: 6931e84cf22fae93782634411fd141f066effe144c17942f42c11cb56b4b9543

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