Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3cbd9c07f76167…

MALICIOUS

PDF

71.5 KB Created: 2021-09-30 22:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7b97e87347d13e0027949683a76fb82 SHA-1: bfef8aef27277badb4f23f6f07c30da417e3b0eb SHA-256: fb3cbd9c07f76167b58fc73afc66eb110f7316a06ea35923cc0b5f01528395ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://neonatal-surgery.ru/userfiles/files/nefudonesakul.pdf In PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/9891734423.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33465482612.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0f0fcfba5---56996077752.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/67653244205.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/61877788878.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/26785321791.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/88566414700.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/93882879948.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/a0k3oqohp3omjpoeua5a9bcghg/8194403652.pdfIn PDF document text
    • http://ipllaser.in/uploads/67637945316.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/68d1f560d73ebbda0a054877705cd6bb/wutixitidowafuluzakurozof.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/71201788905.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/79312608763.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/fdc9aefb80ac989895bf4a7d064d2c04/68045010972.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/61261582840.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/xidib.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615446a947c11---xotukovukezez.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/rodanojumodoxokurekatabe.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/zawolezulafirupu.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/gavizosuregisakegawamo.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/dejojasizemovalejojisurop.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614118d42aa2d---xogejutedowiluvikepuv.pdfIn PDF document text
    • http://foodchemsino.com/d/files/putezuvegixazik.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/24106422908.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/68227574350.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1c4de725f9e87cc8937227019deefc1e/61663921032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ghd+sports+live+cricket+apkPDF 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_off0000b4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B0 10704 bytes
SHA-256: 30383100daa7c2fb3262da092f73c989035f47a42c481fe30390148e96173009
font_01_sfnt_off0000cd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 16840 bytes
SHA-256: 58f31600211a829cd580e45cc42036b3e9f9c31fdbbf2272bbffb65d6186345b

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