Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a122b46f5d8fee…

MALICIOUS

PDF

72.4 KB Created: 2021-09-13 18:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db65d95947f35ed4d2a293533f7114ec SHA-1: 4c9d51a9a180fe219f9207d51869d43ed69858ab SHA-256: 32a122b46f5d8fee9ae3ce2ab811df4e8d432c6f62a26d9370a8e0cb51fc7696
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised or disposable domains. Heuristics indicate this is a link farm designed to redirect users, with ClamAV identifying it as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence, suggesting malicious intent. No scripts were extracted, but the primary attack pattern involves luring users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=wallpaper+4d+for+android PDF link annotation
    • https://vili-al.com/uploads/wysiwyg/files/88158048484.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8143af784---74802843635.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/oq6j6qauchhppe56pt8es530uk/liwowozimujajaned.pdfIn PDF document text
    • https://auto826.com/uploads/files/34230171333.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/54816528048.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/25055944362.pdfIn PDF document text
    • http://shesob.com/file/files/3518083574.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/kisilazo.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354fd7a4c3f---kubokona.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/73972b6f1222c383340c888e4963b43c/46481431542.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/gutidevikamemebenu.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/sipitalena.pdfIn PDF document text
    • http://stonebreaker.at/faniwaxinoregesimeze.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7301ba21f---70935962551.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/5002305225.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/458aba35433286faa15dd6efe374429c/dekewetesu.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/89469198565.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/norevoxuzuvofuwisigaw.pdfIn PDF document text
    • https://cian.hr/userfiles/file/depotesomafopavozo.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210908035311.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/sedep.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/21905844003.pdfIn PDF document text
    • https://windscrm.net/files/file/wadurusetaduxodezasekan.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae50634447---3141187607.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/sakalimetal.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210912_54A48D7E3BCD25E4.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/bikulevidibovukeb.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_off0000ba0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0C 10296 bytes
SHA-256: 1ce7b512f1b2bd131091ecac9a80899f0020842e23a090f97606ebc3210daa4c
font_01_sfnt_off0000d14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14F 16572 bytes
SHA-256: 120d7d38ebbb3cc4d52c3f882030064f3249c29a6d59adcffa98f6b8f218e7bc
font_02_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1