Malicious PDF — malware analysis report

Static analysis result for SHA-256 83279c1e1c1947fe…

MALICIOUS

PDF

95.7 KB Created: 2021-08-09 00:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 13ece4d4110b1fdab8ec6ae8f05304c0 SHA-1: 583d9eb651005717956d9e6a03ac803a17427009 SHA-256: 83279c1e1c1947fef70c2fbb284b4f49a250f5eda68202ec75386f24600252df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. The file's structure and the nature of the URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://quaretti.it/userfiles/files/71723195964.pdf In PDF document text
    • http://www.heksan.com.pl/file/61458593080.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fc46c1993c5---83313143096.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b074ecb2545---37333058372.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/wasewogidagexapugovug.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/63473474643.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0522a7f554---63511810673.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/taxoros.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/44057019474.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1be4bdeabc644a8cf0d6e6fe591a7d32/36202318102.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/vuniranexazaxipux.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/26992015280.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7hqkuaeblqs3d3s0ojfm8mnnq0/15966471130.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a04423d35---finamafolidimofinako.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/btfhtm50mhtko5mgupisnnna7i/9206657468.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/11225821251.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608670f847176---filomikexigekiw.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/wefupokekumo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf625bbb205---tepaxijajanefewuxamab.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/vixetofililijalirudile.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/c6a87d79fe69c3e7325066f2dbf0d859/20336921271.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/69188341511.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/bunewura.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/bevil.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/firuwegilazop.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/52335091112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+do+a+unit+root+test+in+eviewsPDF 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_off00010f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F90 10436 bytes
SHA-256: e870e7b5940116e03e5523baecd4f45768c30b5416bd2fe2ecca17292a442215
font_01_sfnt_off00012766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F78 18592 bytes
SHA-256: 28c6400c9d8c7286269f6d7bc7a6fd7a321db2b777a2d8fc746aa48150896342

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