Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ef95d06833dd03…

MALICIOUS

PDF

95.5 KB Created: 2021-07-21 03:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d30d0049666e58f8ad01f177f05f193b SHA-1: 1b3c2555e110784c7f68d559259d661090fc7b06 SHA-256: b5ef95d06833dd03d58f0e281e042842273b9ff27d0f8e4b81eedf38a9cc7055
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites, many of which host other PDFs. This suggests a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/431207be3a81f7665844057c3a564401/vewuxinutuwineleso.pdf In PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd34207638---24959485693.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/xowuwogex.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/4d506bfbcf1af732843b8f4ca4fea412/fonesidexubadukonikuwo.pdfIn PDF document text
    • http://ubest.ru/images/file/surowedi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7dc557d95---bipopitezidog.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/504919f9fd58558c485018bc61f0685e/50760873470.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/27896270817.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/91814158910.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/23825360397.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/zavogexed.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/4802306207.pdfIn PDF document text
    • https://partnermind.cz/images/files/58695562356.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d740bed17---93653641608.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c5a6601a11803105482b9ec5e4e1918b/48614517602.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/24971904023.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/554349981.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/86985870598.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/73691211742.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021062013143073499.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/kepujazuwezuduzesowopexa.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/h9p7r3dr6udaa3fjm1ubv73hkg/sobefakesop.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc60cd58e---gerurosajaruwaraf.pdfIn PDF document text
    • http://lu67.com/clients/50962/File/47415379528.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505111514856575.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc71bc475---geselajoga.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/sumizagus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=edi+mapping+interview+questions+and+answersPDF 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_off0001107e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12890 17792 bytes
SHA-256: fbb89f52d6edc2c829b8eb6c33ade0404da17b311566d31f4313a03617cfb24b
font_02_sfnt_off0001573c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1573C 11068 bytes
SHA-256: 79fe7355bcd1d474946241718142c919eb60ebfe32d58dd84929b0bd90e9b9ea