Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b5a829d1964fe0…

MALICIOUS

PDF

118.6 KB Created: 2021-06-30 09:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f75ab072e1450d54e345f7843c9609fc SHA-1: c9f735f8cbdab4dd81f3056e155d1095665ce8b9 SHA-256: b3b5a829d1964fe0b927426e303ed0a35fc2be42f36c68594d2cf14b2968ff0c
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised CMS upload locations, suggesting it's designed to redirect users to malicious content. The presence of numerous unknown URLs further supports its role as a distribution or phishing vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/kc5dmk21518brh2vb4q3i4hsfa/sepopemofefoveguzuxonudiw.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/2mkpaj5mgu50tpqlnj1nkqjnrp/sanujis.pdf
    • https://tenekedjieva.com/uploads/file/25094627785.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/6866564979.pdf
    • http://softwarefactory.nl/images/file/15206581079.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/55584858102.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/e56f60d602b2c8973596b993d6d85892/negolino.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca9d5a646---3506161974.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca3e18823c---70629085420.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5cda544bc12ff4a514277cda36884047/wozebo.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/uvhe7pifr7t3orbp5v6ks3b196/82174848986.pdf
    • http://novichiha.ru/pic/file/vulodavogibexuko.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4330b39f50---sobisipojikukufefijad.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/pif2h2hsn5bk3p9oeh30gv69v2/18653843382.pdf
    • http://skikk.nl/app/webroot/files/userfiles/files/forem.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc3c8d787---11583388003.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/98290c214aa1989ec8cd85bc49906542/worapanifuguxavegelaje.pdf
    • http://stardentalcare.org/userfiles/file/wigovatoxubukuput.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/00353987bbf78bdc56d93cb97566228f/favafosaninenimapowevuxi.pdf
    • https://jxloanchien.com/style/postimage/file/58003010743.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071afd74e78f---83444993681.pdf
    • http://www.ecostroyservis.ru/File/zomotokaviwetoperosuvogin.pdf
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/28908266879.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=physical+characteristics+of+sharks
    • 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_off00016c66.bin
50a1176d17c903317147215dc4b4b6b950abc9587ab202423f155bfd49fe3b6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C66 17824 bytes
font_01_sfnt_off00019b1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19B1F 16792 bytes
font_02_sfnt_off0001b336.bin
4281ed6ff08885e05ca5d3143ba323e945cfb68972cd45bcb1c1ed6d4347c944
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B336 10536 bytes