Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c42b8cf246c1350…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 18:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ecb703f7750d4a5f24ff0ea472b765e SHA-1: bea4496f1a70bf2ebdc218705f8945d1c0b9f157 SHA-256: 1c42b8cf246c1350c3149cf08c154d13e0b4a43fa4457f40ff9b92df20232ab8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. Heuristics identified it as a link farm pointing to other PDF files hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://showdetango.com/bafa/userfiles/file/rojaxepalevokolitalorix.pdf In PDF document text
    • http://limuzine.md/userfiles/file/46473362243.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc1c5f810---99812243009.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/tosedemuzeta.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/dawojigagumorejuwa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161313389dd606---48827455885.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/zakoburubefabib.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/ziduxivofuganenimasageb.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/bonaludogivase.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/zositobasugatanuxemomu.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/zepibofowusoxajugi.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210910231517_844677129.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/25608452273.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/69a88a840db9d27ed40326214c977f63/67128275650.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6b03117e---nakulikazomufimagi.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/vonoxijaxetesukalilusepi.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210913_151852.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/63064913722.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/genabet.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/gamezuzetekezowipegu.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/32339631003.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/weneruweguwijezobunin.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/niwizegopevibezisogesar.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/79872645884.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/82487528633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=folder+transfer+app+androidPDF 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_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA61 17116 bytes
SHA-256: 48225111d9dac1b9e9ebd4e5c93e1364fcc01f45f42440fbfa33ea922a2770f7
font_02_sfnt_off000126aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 10468 bytes
SHA-256: 00d4ac270fffd5c16bde7ec508e106465de449d7cecd9d8cece54bc22630b135