Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cb52cb5ba6a26b…

MALICIOUS

PDF

95.1 KB Created: 2021-09-19 10:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ff917ec17d8d8318c4dc60d8e78f8b6 SHA-1: a10a5707585d16533e79d42f32de6ad54213c0e0 SHA-256: 83cb52cb5ba6a26bbd35e276182927210a37a43aafc1d9689087f8d5fa18f43f
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of urgency lures further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://skncn.com/u/files/dotaxariso.pdf In PDF document text
    • http://esistore.de/userfiles/file/xilosikobarolek.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/vl6ct67og15obi9kvui5untngs/folamumodejobodexat.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/wafasinagegajobunod.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/silanusipomir.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/14461686261.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/73688451080.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/zadola.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/10770213584.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/fuwisi.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/10016478891.pdfIn PDF document text
    • https://sanagustin.cl/files/79374120512.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/14349450666.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/b1n3j9bqckfs9bbg4t5u497nul/10207006607.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/27130393926.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/sanapuxap.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109051517219234.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/wedazubedozavilunubebuf.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/96792517856.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/16078348518.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/supifosugeradaxutodik.pdfIn PDF document text
    • http://medica-brno.com/files/lesugofepuxinetofir.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a0fcad515---42088886416.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/75993850571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=outfit+planner+app+androidPDF 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_off00010f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F56 18496 bytes
SHA-256: b2827ba4b8c4b4035aaa7501d307541b102b55a4c6f63b36e4a8b20388ff2ee2
font_01_sfnt_off00013ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15709 10448 bytes
SHA-256: e630fb772154a8bd8eb7be0852391cfc1c6f94e440788889409fc904caca1d88

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