Malicious PDF — malware analysis report

Static analysis result for SHA-256 958eabdf0a514e01…

MALICIOUS

PDF

93.5 KB Created: 2021-08-01 00:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33af828437c7360ee8c1f4f352df927a SHA-1: befbf5267ee06b5f01688b101d91aff4bcaf88dc SHA-256: 958eabdf0a514e01af841f28a550f3b358844741974792192ceac278516a043d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://rheumatology.institute/upload/content/file/xotutorivewotoruxikevasa.pdf In PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///88284249831.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a23b2c66ed---92917960556.pdfIn PDF document text
    • https://nistd.in/userfiles/file/tomefumuxupigomu.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/mofuzexaju.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuxazumexijobotanifif.pdfIn PDF document text
    • https://scriptdd.com/_file/file/91873507578.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6cce2c38f---vuzomelelelizonemuviwuk.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a759e483f9962b25f558b8fbb769453a/timidu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607efdeebe98b---2055550634.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/02aaa27514cd53f56476b7461663a987/5781621766.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/petokulotusexugofizawemir.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/4fld4e3sg70jtv2h9jt4tpjufr/12609717207.pdfIn PDF document text
    • https://tonitomov.com/picture/file/basanabonibitabasidoganan.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/40320691571.pdfIn PDF document text
    • https://abeess.com/userfiles/file/gujebeforurugosinevi.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/vomomofelemuzi.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/8e965beb14faaaf7441b36b46c61311c/jakazemelabefete.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd145bdc1c---tosexunituguv.pdfIn PDF document text
    • http://cichanski.com/Upload/file/zigib.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/21942237665.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071c813cbfbe---52197335845.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/detusevorejogokim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=does+photoshop+cs3+work+on+catalinaPDF 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_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 10824 bytes
SHA-256: 4311de00d7c56ee0290a465bdbe84d15069dbaa016aad8080def23f9826f2473
font_01_sfnt_off00012025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12025 18288 bytes
SHA-256: e98f5d74e5da368fd535c2a1ebd1f06ecd07b22a5bdcb60ee056a3c26f82e927
font_02_sfnt_off00014ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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