Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b974430fc66828…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 00:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d82b059b01efc40a11d30e2d6149a408 SHA-1: c5d74c531ec75e441861534ba357cf8e5e30531e SHA-256: 82b974430fc6682847d9ffb509c4bc9b7d57f6ffe37fc23e1a5f9644b1bcf3e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alda.pl/ckfinder/userfiles/files/vebovurifolemexakin.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/neus1kdbktia9mv5jhrp0gm8n7/tixumajiginolit.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/0287rv4c9m12q9n73n4e717ss4/bajixizarirew.pdf
    • http://techbico.vn/uploads/image/files/bexisi.pdf
    • http://sarljarry.com/userfiles/file/15664419509.pdf
    • http://araonline.hu/uploads/file/55910312491.pdf
    • http://jyotiacademicpress.org/uploads/file/10783305497.pdf
    • http://posicert.com/upload_fck/file/2021-9-17/20210917084852439020.pdf
    • https://airxps.com/userfiles/files/7019653484.pdf
    • http://mitcostruttori.it/userfiles/files/giwewanusidatoxasa.pdf
    • https://rumusjitu.com/contents/files/bagipif.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b60de4c7---posinokojazefizeduv.pdf
    • https://wsbtitan.com/images/file/36523562906.pdf
    • http://uni-farm.pl/ckfinder/userfiles/files/99329558661.pdf
    • http://bet-balance.com/userfiles/file/79019426781.pdf
    • http://grotech.in/userfiles/file/29858331702.pdf
    • https://istruttorecinofilo.it/userfiles/file/37371252889.pdf
    • http://tsyrulnikov.ru/upload/file/wezara.pdf
    • http://dailyxedayhang.com/userfiles/files/xadeboxitidotojuzelirasu.pdf
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/13631830225.pdf
    • https://elemonbg.com/Files/File/javexamotutovumopi.pdf
    • https://listapp.in/ci/userfiles/files/wifejixibobazonobakemezo.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a825408f0---bojijejilibeta.pdf
    • http://neo-net.info/giganet/files/file/jidoruparolol.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+download+animal+crossing+in+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da21.bin
bb078181c477f4b7deb2f6c7dedd1a7b6a9832468962bca96623bf1c534a5c25
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 10660 bytes
font_01_sfnt_off0000f24e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 16792 bytes
font_02_sfnt_off00010a60.bin
4a25b410d76d203e84e53b3ee230c31c5a0698dd710113c7f96b5c8dc5967701
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 16812 bytes