Malicious PDF — malware analysis report

Static analysis result for SHA-256 0106a5b9c38be848…

MALICIOUS

PDF

94.9 KB Created: 2021-08-18 06:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 737c40ae0bfa8758bada341139517ec8 SHA-1: d034bb5092b3ffdce9ddde6863448e373a581bef SHA-256: 0106a5b9c38be848637a51a9d016d31f892741ab6db85c4d2c4979edd6cc1133
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to potentially malicious external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/d5d08b635f76cb674239eb406903bf1a/xizijasapagoferirimefebu.pdf In PDF document text
    • https://aterhesseg.com/up_image/file/40642228553.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2fd2e667f39510bef7aabc321023eb88/lubodagan.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/25372444033.pdfIn PDF document text
    • https://emprenderem.cl/files/ratodufunegekema.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/muzetubo.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/77573212990.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/16206580761.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb5fa38cfc---jodekifopefazog.pdfIn PDF document text
    • http://dymenahealthcare.com//upload/fckeditor/file/98913109538.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c217a32e3---70546812440.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/92300890688.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/zivosulujidasa.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/42479936088.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/9rfos53mpnoufc0675tp99rrjp/83184873309.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/20019866808.pdfIn PDF document text
    • https://virker-ikke.dk/files/56367476409.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210709152539563364xaiob.pdfIn PDF document text
    • https://aedwea.com/upload/foto/33389399996.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/67571523003.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbfc980012---48770525574.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/liregefafitip.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/38190507782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=julian+date+calendar+armyPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB1 10448 bytes
SHA-256: 78da7b0c00fdbeee185cc8613be181f0f218a7d3f2ad32b7962e2850cbfed16b
font_01_sfnt_off00012457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12457 18132 bytes
SHA-256: 5cb611b33ac04dab7680741f13ec2b65d31536432c09cf1fd735a6d9f57983a2
font_02_sfnt_off000153f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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