Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2904ac38d427f16…

MALICIOUS

PDF

87.7 KB Created: 2021-07-07 01:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 294404bfaba6c6981f0c6fcade75a213 SHA-1: 36caea3a663cbdc63dc891c46dd8cddc01e0332b SHA-256: b2904ac38d427f16499c43dae314217a3f211caa48da16d5faeb890d229474d2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites, suggesting a link farm or redirection mechanism to deliver malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=skinny+thigh+workout+at+home PDF link annotation
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9562252fec62d0aac17260922a43a2ee/60816966159.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/qjhv683tefjtf4m1atga9876rp/83147429348.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ca8da0ac3---pusipiperife.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/dikorarujakudixukuzeb.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084e1dc233f5---30730319349.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/73976238468.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/520ae3cb4536a81629a79e738d47f4ea/jijupevibibozevemu.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/folalaverusom.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/nasepisizodepexexut.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16079c0a5770d1---wolowolotesuretara.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/b9hqbn9nuiqj26u20iv40ikes3/vizew.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/53605610655.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607916b55e32a---jubokofol.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/26304812795.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3f5b1rdkis20ci141ojnv3ffo5/zoduweditibo.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/dd2toupo43qr4dn2m0jvsg26te/winedamafoluverifu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5dec04d006aa88464a793634ffc9732b/semofekifuwuludowuzoji.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/fuwiti.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/48b09b76677fe48e57106b1a92f61b15/datujojulov.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5a6446fe1---24767136729.pdfIn PDF document text
    • 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_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 17108 bytes
SHA-256: 3a4431189c77bf10b6e9cd7c554f3d5c23a54fab610559f21c9d504f421fbad5
font_02_sfnt_off0001375e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375E 10808 bytes
SHA-256: 61e1e39ee3e20aa2506710acda0c525291e67be7d80de8ced698945de4c1acd2

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