Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd7d1e44211e476…

MALICIOUS

PDF

91.4 KB Created: 2021-07-23 07:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: eadb828af9170c3a13acf1492bd0bbfd SHA-1: 4659eac86d5fc0fb4c5493f4a8ec4213c3430a9f SHA-256: 1cd7d1e44211e476c469bc26bda208b9c65a4940c5a33b923c06a15db2cdd860
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://3bbb.fr/ckeditor/upload/files/vekatepiluge.pdf In PDF document text
    • http://train-in-japan.com/images/blog//file/jajidusekov.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/33828660781.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/j5cal9l9uodptiu04dpc88vgue/bagigaxirebajusirumu.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/jujukowevuzufowu.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/91645033751.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ca7d730acc5---56683459941.pdfIn PDF document text
    • http://olympusflights.com/files/files/seraga.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e499642fb24---25699691872.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/93902909894.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e99af424191f772859f99aeeeedb4d17/rusodazozog.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085737d58ac8---34465152318.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/pukuzenumasesupifa.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/b3k3391b1kecr7g505ojbloai3/talarede.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b127850123---3059289063.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/kusevaluwegifizazorotaja.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/nanegituwetinete.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/aea9dc4374515b80bbd0a576dc0fe4e0/4955581916.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/43178347847.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072173f0a970---zumemafeg.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/65801498818.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106071644340512.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/tafiwonekenugemolawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=largest+single+stage+snow+blowerPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5b0fb786dca852df4ff124610b0ad8c7/48013354008.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_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 10464 bytes
SHA-256: c7f04073ffbed688970aa4a1b7249fcedb58e5c787eb1afd9131fefc99392afe
font_01_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13461 16716 bytes
SHA-256: 9c62929baf7e8cf4f57135e380cc584594ddeee7293d0426673a04a021c876a5