Malicious PDF — malware analysis report

Static analysis result for SHA-256 542932d612ca455b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 01:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7d4bf499ffdb9888174e43fa1bc037f7 SHA-1: bb278be19f1c3213d05144537c4b393882b23689 SHA-256: 542932d612ca455b0227c18da2fb447536d3464eaed1b75d98e1454072416005
156 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories. The primary purpose appears to be directing users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=specimen+zero+apk+free+download PDF link annotation
    • https://inprovitcaribe.com/ckfinder/userfiles/files/puxelibapiniresodugogoge.pdfIn PDF document text
    • http://scsytech.com/upload/files/63899794144.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/25142521374.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/vifaxekakewabukara.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/84883288251.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/2545889942.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/vajezomubulusuwer.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614023036f630---rezafapu.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/46093153315.pdfIn PDF document text
    • http://rococosofa.com/files/files/35023149448.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/94655278249.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tamexinasulerema.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/64014590548.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/dumixanabone.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/63535389250.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/38894066396.pdfIn PDF document text
    • http://ergakiland.ru/files/files/vezorojili.pdfIn PDF document text
    • http://stylekd.ru/files/jugodenopigofa.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/74048973677.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210914/210914143741296948tu5ap39xe841.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vekogarelobipo.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090412183473499.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/38eb5b39ec63a4cc245047d1bdeeb940/45387637399.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/49ac7b213503eda9bcadb9fec83fc223/13889431763.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_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 10828 bytes
SHA-256: 450413d801d02a7d9a2e091889b99afaa4bdfc271a7a5e8dccf8f8f25d6f9c5a
font_01_sfnt_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 17336 bytes
SHA-256: ac1cf617aeff4bba89fec157b1b75c376a4d8d1c7da46adf3c3a18e1728421d4
font_02_sfnt_off00012af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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