Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9122e87710446dd…

MALICIOUS

PDF

79.2 KB Created: 2021-08-27 06:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fcf1170193e0120110341e34c6038443 SHA-1: 02f355042cbe4ee5aaad3406a9e7e325ce413379 SHA-256: e9122e87710446ddc7e568f0f80e91fb72b145530c2e9559cae058efdbdc4e61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=zolpidem+and+diazepam PDF link annotation
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/fe5bd88225cfee62ab3d4395ba658918/21957044261.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/fasepep.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16112db601ed61---13712304413.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8421365ac3---36325697527.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/40ougu4nntdoqtsmv1f125ipoo/zepoluxebokosusosubufi.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/vijepb8u8438v2l2ltn612ff7c/pifivokerefo.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a1a346b10---lizolu.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/44826068278.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4ff2348d51fe2ee14bf8c51eb9591124/33485998853.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c5634ee71ad548e682d74b13590c4f4b/67865118780.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3b01437e11607dd6d6d2cec4b2ead9b3/97684416116.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/v42b85u58tm40pgh25nqv94pl8/lirapag.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/l37ohhrr925l3gv1n2g18v04n3/pukimasuganala.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/jovibaxiputagojadopeda.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611e2b87ada66---jorufaketixidosuwufeb.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fae4ad135ce---jemijel.pdfIn PDF document text
    • http://stattus.com/assets/file/39428304847.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/48476532455.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/zadumifetumewuvu.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/rovafumu.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3508947abc---45679939359.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/29841297079.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/130c73233bce954590592be25795887b/dorokosejijaxikafojab.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_off0000d622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 16400 bytes
SHA-256: df0f0328d4faaa2618b6cacb664db165922c3bdccc09d32a72d33ef78ac38d9e
font_02_sfnt_off000118e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E6 10208 bytes
SHA-256: 04d27514f895c9be65a9ef52f7416afead9ba575cd25e91263504e822e0e5470

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