Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ff9089e2a5d57b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 14:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aec105194f45e57ea03912e5287645c0 SHA-1: 7d0fe63eca7e0cd7598cc715498b070067bfea02 SHA-256: 05ff9089e2a5d57b22cda6ffb65d1e1329046b50180cae581df513e2400fab8b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=canon+imageclass+lbp6230dw+user+manual PDF link annotation
    • https://eobliecky.sk/userfiles/file/rigolamabu.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/nekuburawedukuten.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/61542739589.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/kiluzanoratuvapatariden.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3c4b938c9fa20562e17ebbcc5b3f1ae0/nonugosuzatarojuvot.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/62753860439.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/bajubiz.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/70974485609.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/48f8a6e0c7f8e0deed13e243c5809ee5/nuweti.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/mereregazonepitabinovapi.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec473f3617---fiwizerozoxeweb.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/42239442157.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fe214a03c4f---fuguwijadinafo.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/jazofuselujarutipi.pdfIn PDF document text
    • http://hodori247.com/uploads/files/togozofolaviwujax.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/56906478163.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/mokagejelo.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b5cbc1032---kokuvupedenupamowedog.pdfIn PDF document text
    • http://strandedtattoo.net/file/zewesosofoparajaroxo.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/65740944734.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/83291998.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lk1v53faiu9esr7jvqocuhcje5/94535964133.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd3512bed0---94155775862.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_off0000e019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE019 17852 bytes
SHA-256: 56af48f2d2478fc8c5c1fe0b6fe5182b1c51cc84ea8d33271ad60272b0550efa
font_01_sfnt_off00010e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E37 11696 bytes
SHA-256: ab6b3a2f8a98977e98a9c06921c0c1deaa7c40c729d2c41a86ca23bacf7c2c25
font_02_sfnt_off000129c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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