Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47bb8fe21b4ca70…

MALICIOUS

PDF

94.3 KB Created: 2021-09-19 22:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd35f9d00ded59fae6de185554804049 SHA-1: 7dd6b679bd129d1aea898406c70c81d4333057e4 SHA-256: b47bb8fe21b4ca7098f461951e114f653a0338134a837b2667c507e16e5347d1
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. The presence of a 'download button' lure further suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=fifa+21+mod+for+fifa+14 PDF link annotation
    • https://zaragozadenoche.es/upload/files/71270447026.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/24382950131.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/27624f4c45b6162f98eaf7c36680f740/buveronixakigibidab.pdfIn PDF document text
    • http://atrsara.ir/resource/files/6704063904.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/zivuradunoxawunivanofan.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e4098662562314b7dddec3481417e6dc/85392574760.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/85582673242.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/55702512202.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210919_175225.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/tidofe.pdfIn PDF document text
    • http://maxbrio.kr/files/files/74714029872.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/85784352206.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/12488136506.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/katexijowelapimod.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/91029584101.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109160830471835.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85034cd52---2035276487.pdfIn PDF document text
    • http://mopron.ru/upload/files/89831064034.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/mowidikupuj.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/xogabufa.pdfIn PDF document text
    • https://trexanh.net/upload/files/jumonawopiv.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109140106233478.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/77296658560.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_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 20800 bytes
SHA-256: c40d13e019d742b9ba3599c3182480806faaf7222bdbdc43c91eea04e547552b
font_02_sfnt_off000154c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C1 10192 bytes
SHA-256: 835dc641563e0984c7da43b5843011a2025ce174a2cf1d5d1f3fab4c90dd6c66

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