Malicious PDF — malware analysis report

Static analysis result for SHA-256 852e80120942cd33…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 01:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: edad3e45e89bb35490ab20385d1886ec SHA-1: 85f29b402999c63f1edda7dcd9387d9047b82716 SHA-256: 852e80120942cd33c296b3d56be462156a5ff95f93f6d0e59193b98551a076aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://queure.ru/uplcv?utm_term=messenger+fast+download PDF link annotation
    • http://podlahyadvere.sk/editor_uploads/system/files/zaxujemepexovegasomakod.pdfIn PDF document text
    • http://lejuriste.ru/files/file/76984424028.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/kadibemogizarido.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/851bbbf209db0f42ae8dfc133588f5f8/78226962430.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/87956005880.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/wenonovaxar.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138c79c81445---vipedapuz.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/tufubefo.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/numajoroxafitele.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/tavadixabozenogadetugi.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/80142951369.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/38146366452.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/87573423615.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210902093839.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/33358360273.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/788a38c1cf1b83476b31a177ad1ea903/suvod.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/vuvebitovafebaw.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/91432135206.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/83357802501.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/jodumugenalonare.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/vifozuxujoxisasujal.pdfIn PDF document text
    • http://land89.com/ckupload/files/15908826866.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/30482094077.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/128cd5a55ea2d68daced305b670a44bc/nawatojokiwebivexowomolig.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/77288662324.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/jujekukorakure.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_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 10516 bytes
SHA-256: e64f8beac7fb5ee9c47b392f30abd79a22fef622a92736517e95bbfd439d9c59
font_01_sfnt_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 17184 bytes
SHA-256: 63a9aa5f66e97684daf4d1e561918fe706429fb7c5a22ce480bd4fea05637ba9
font_02_sfnt_off00011f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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