Malicious PDF — malware analysis report

Static analysis result for SHA-256 808b91d0e84877a7…

MALICIOUS

PDF

82.8 KB Created: 2021-07-17 03:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6647e06f8a47f2f80c6182a12f901dfd SHA-1: 95edba997acaafa105e8640caf5cb81a767ff8e1 SHA-256: 808b91d0e84877a75b44c46dc3102503410f162e2a6c13870279e7294b6b58e3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs are likely part of this redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d95ccc836---wimexifakuzul.pdf In PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/4lfmvg1p2a7kgqn57pei8ct13o/68221195189.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/73960941854.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/sawijigipobeb.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/kisijebivefane.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de038c79445---91394269082.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/fiwijamege.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/wolawulosumede.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/70182202508.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/010c43d804ee2b9aa46e618f7f5c31de/jumilowipugusefuzi.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c576d7d2---78333529082.pdfIn PDF document text
    • https://paperland.bg/uploads/file/27369987348.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c12efd04---65715201707.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/20310577933.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/h2f3p3gg0f2rulbmfloso5a5so/wefoxibeluzilapetukebi.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/wutovowurezunuve.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb4295557---titegujizidi.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/26f713af0d55f7e9b2e660352097508f/tejukimililazofixuzedidom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=digital+odometer+not+counting+milesPDF 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_off0000e053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE053 16816 bytes
SHA-256: 7ba65d26e0289b4d985d9f198b3f3c583d655fad43e88d66721bdff86e621bee
font_01_sfnt_off00010bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEF 10812 bytes
SHA-256: ff736091fcb00f9426490f9bb477a96a2432e66720315b144b6d8e891a981924
font_02_sfnt_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1