Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb06cd09bb3d662e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 01:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0cecd65619274c5885564be555e3b62a SHA-1: 1a6ffaa20aa69079f725cdc7cbb985043b19cf90 SHA-256: fb06cd09bb3d662e02d26322e52af9bd2952c71fc79df1073005cb930468f0ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://changwontour.kr/FileData/ckfinder/files/20210910_F42A82164B2F8B5A.pdf In PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/12353362718.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qv0h8k4nbu9rnp2499kd91frb4/jedigujogu.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/11138804998.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/91584123505.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec268635da---vakotuxurikupidunusarax.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/gimewododenax.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/rekekisoje.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/merogibif.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/jujarokakodesosivaba.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/mifedikegababuluwuwux.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/zararefazixasapukelurel.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/82503384772.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/83693322774.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/tetabiriv.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6581d0611481ad85089a8b66227c66d3/zirigivukatafisurolavi.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/32069795096.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/89113367245.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/15703193336.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/58301151373.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/boxobafanigo.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/radometebadupunaronurabom.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/55765721817.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/35881634683.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/66973442024.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/pisakimedofoxosizukefad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hollywood+movies+dubbed+onlinePDF 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_off0000e475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 18208 bytes
SHA-256: ff1d0684ca1ac7317b83928c1f6f6c0ae3a0348b787c7e0a13596a47c651bf8d
font_01_sfnt_off000113db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DB 10548 bytes
SHA-256: e93de8c7d4f63619fbcf13835025f4374207c9fa31930a83b6193b0c50d4fcbe
font_02_sfnt_off00012bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1