Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecafeeded59147dd…

MALICIOUS

PDF

85.1 KB Created: 2021-07-21 09:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9c0fa1c4d030985e50c75d143ac3068 SHA-1: 23b1968eaf50ff8b91a4df105c5131b0dfee69ca SHA-256: ecafeeded59147ddb1135592ad63d94bf7a1c2a930e0fdbc7452de7d02695717
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acf80aa14c0---jawenepujog.pdf
    • http://svx.su/ffile/file/90686005587.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e31e481f7b0---3433154033.pdf
    • http://thermogroup.ru/uploads/files/vejoxal.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876d25ef73b---tuwogaboravos.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3157c2f116---88053506148.pdf
    • http://kapsalonindex.nl/images/uploads/46078901456.pdf
    • https://hostessima.pl/userfiles/file/wupubefakanufamis.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c61d6749ee---79078404009.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ab051f4436324d4b0849f0a273c9287f/53118784136.pdf
    • http://centreforeffectivecoaching.com/media/file/gopofupaxesusesukizu.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3b2faaa96ed191e01f8d4957d88dd2d2/negewikusemubu.pdf
    • http://branonperformance.com/ckfinder/userfiles/files/84437279618.pdf
    • https://ekransamara.ru/files/pegakekuzupujigikis.pdf
    • https://autonoleggioassereto.com/file/kenenifefusazo.pdf
    • https://agronlogistics.com/userfiles/files/vojuw.pdf
    • http://sewakendragroup.com/userfiles/file/2187593639.pdf
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/nixonuzedudusuwepakir.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69e8cf9b1---sexekeleturazonelirul.pdf
    • https://deltagroup.bg/uploads/file/xuwigojupanowutapipej.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/denoxagaretoveveribam.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083acddbf77c---10625699995.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37fc7da0c0---gakogibamuzesivanolifiv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=measure+of+center+math+definition
    • 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_off0000e9c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 16792 bytes
font_01_sfnt_off000101df.bin
4735bd521522e7a27c0f6da8db6f0d1eeecf16e0277ea549b967e2c149045d4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 10788 bytes
font_02_sfnt_off00011a88.bin
9ab1a40bac45707ffd0be9968f0b72ba880ba23a25a5b9126daecb47a150c41d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A88 16720 bytes