Malicious PDF — malware analysis report

Static analysis result for SHA-256 c011eb82b1f9702b…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 11:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aee08bc6d7181148ce1729f2af998355 SHA-1: c5ce35c0b195ada672bdc4733517fd75e51442ed SHA-256: c011eb82b1f9702bc92418f84ce990deabec6586ba61c9a842d5b0ae0dc971b5
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The presence of these links suggests an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dreamsurgerycn.com/ckupload/files/11144641609.pdf In PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/tujukanavukidosuzeja.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/kerewoka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138725608803---defibarakarugowowasorozow.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff2c29b5e---wuzakoz.pdfIn PDF document text
    • http://shesob.com/file/files/38844791543.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/menota.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/xemunugitelilasedituvi.pdfIn PDF document text
    • https://agatanorek.com/files/file/melatewivubasenoliv.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613820994bc92---komix.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/5712da7f1b7494a89545eb46425c3bfd/lafevelazelajidizijitoje.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/nokukefezif.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xominosupojifedes.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/38430984100.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/sitajijenogosodusefo.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/lovito.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/vumoxulegaladijatevilusa.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/13011980306138d6b15e2dc.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/gukurujaja.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/duzubopa.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613115dd3d092---48578739778.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/68067592106.pdfIn PDF document text
    • https://tch.lu/files/files/69839677967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=grindr+apk+old+versionPDF 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_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 19556 bytes
SHA-256: 10d478e8bee2da724f8e776df20be0b561acdb38b567acfb08a458ef70f1efc9
font_01_sfnt_off000118df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 10484 bytes
SHA-256: e3640fec89ccdc5a119860b211100c4677d8aeab68984b5891d999df37da463a
font_02_sfnt_off000130c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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