Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6c10fa250f136d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 13:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb3804dc45e89635c450ac90c0b5415d SHA-1: aa229e3fe78eacf0a187da4892216881cd42b630 SHA-256: bb6c10fa250f136d725cb15c5c855a6ea369acb963f1f239cc7ce68ec4749ad0
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external resources, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://summitremodelinginc.com/userfiles/files/jatikatox.pdf In PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/q7ja8d1decg9gtfrha2ddh3kn6/11654353856.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/15621788805.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/munowetali.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/75896488208.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/88135736248.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5c283a66fe39090ab8fdf0758933e6b4/lisagolimofafalikemumewe.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098404c8df4a---64141388602.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63cd5b772---7803995158.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/vodetejamefanaledanuj.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/94125585407.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/pimizusuni.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/19641151103.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16129d3f999ed6---zitobo.pdfIn PDF document text
    • https://led7.ru/file/46384779078.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/v2linod71r69tkstbcro9eii62/39072872585.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8b8ceec18---zanobug.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/59f8cbf299b16648bdb721d6e419c413/21033520283.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210614131841.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/36549512670.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a01e70e014---birar.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f49882ec60dfb48ebb0937c6c51ebcf1/wekerikex.pdfIn PDF document text
    • http://trovas.com/userimages/fofabigi.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/luwunarofabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=class+8+social+science+notes+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC460 20216 bytes
SHA-256: 3f1dd3dac8ae79aa2cefcba3117701ea5841b6e64e9a2391c6fa145454343d70
font_01_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 16152 bytes
SHA-256: 0f62411f33c11177563efe33ebd0105f37df2a55e6a92cd5aec3f2cc21bf3838
font_03_sfnt_off0001251c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 10836 bytes
SHA-256: b2d090ca849618a9b604e9d7108d4dcd9fa4463f9cc915729b1d5732ca1315e8

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