Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e90bce0ae0b3b4…

MALICIOUS

PDF

96.3 KB Created: 2021-06-29 20:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b46cbae209b06c988a20675bf6c7508e SHA-1: 344b1e1614643ae4ee7f7f9a840dfa17395230cb SHA-256: 35e90bce0ae0b3b4701a43977802e564d3fba279ae7b75a634e23880f839e17a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and using disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URI heuristics and external detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b44c0d4f6---pemukegolazefanukojinogeg.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/38931026580.pdf
    • http://koszyczarek.pl/userfiles/file/67293850827.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd3f946d0c---rafidolukagowumedem.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac902711d63---27024401804.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bd770f2cc05---fisedewubovedamil.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/b9eadfe3833da85990fefc633ae21a17/kudafijofefapuzu.pdf
    • https://pet-fashion.ro/mm/file/ramorojelonuniz.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d2b3589a---26136179617.pdf
    • http://wisdomtours.net/upload/file/xugelupexazabulize.pdf
    • https://raiporjai.com/piceditor/file/jibuduromafesagoguj.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c77d3041ada---gogoxalufotur.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607589eb3b762---wegoxunegogojagefa.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d949b4728---jonori.pdf
    • http://kraski-chernila.ru/resources/file/posuvapikupod.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a64148b4b4f---9712804463.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/07f9afbc21798c79acd6eedf22daa1f4/53184012689.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/1059bd00218357587df77a965d7d7dd3/51370391093.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b4f92cc0---7212795446.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59f40bc429---76358614693.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd992e5f78---konasodima.pdf
    • http://galgalesh.com/userfiles/file/zagulakoxolepuduxugeruvif.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160898aa155ae2---zevigezekegiluniga.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/8ge14e6gh202q9j6llb40mvcim/jefinor.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cw5000+chiller+manual
    • 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_off0001146e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 16792 bytes
font_01_sfnt_off00012c85.bin
dc57874ec7ec8a99699afef49570495dc2c3fa620b7c9d3093a5d8c1480ff203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C85 10584 bytes
font_02_sfnt_off0001448b.bin
c7d9d3467ac14e6444fb9407058f81da4e25ebc9a0abdc3dcfcf40ab717158a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1448B 18660 bytes

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