Malicious PDF — malware analysis report

Static analysis result for SHA-256 df80dc78f73349e7…

MALICIOUS

PDF

78.3 KB Created: 2021-09-03 13:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ac3903197cbb070b8e2eb472277915cb SHA-1: 415f265299ed35779daa706107e94ec9e5ee65c2 SHA-256: df80dc78f73349e7127d9c06a01f1f5017efc7584c6a6557b5ef3a2f0533c626
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to manipulate search results or lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://yejida.com/userfiles/file/92437583431.pdf In PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/pesajakulobapevozite.pdfIn PDF document text
    • https://papiratisk.cz/soubory/bijib.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/20925037032.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/58644942866.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/270bad338fdee837ab96c72cb82b47b3/gumesusojumefetuwolibu.pdfIn PDF document text
    • https://majubesar.net/contents//files/bajaribididekuma.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/57309938422.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8f3421e03---56083665616.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/97619301.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/veduvedikitejotemeni.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/pireremisirexukefakow.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/90163785707.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/sajuvotupitazaf.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nonaxomi.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/29356405518.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/topamutejabufogijepuratok.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/75628509082.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4a9508c5---wubemaravisajikibimimubiv.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210623045603.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021827102375296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=peugeot+307+cc+manual+pdf+free+downloadPDF 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_off0000ccde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDE 11232 bytes
SHA-256: f26072c6f3b41e88133ccbe697424720af327326a6d561e0564c7f09849d8c4d
font_01_sfnt_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 17176 bytes
SHA-256: e3a1eb013f3c22b3f51396bac2e00e0d5f302be53215af5c6109a545df916480
font_02_sfnt_off00011389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1