Malicious PDF — malware analysis report

Static analysis result for SHA-256 9786dbd153b0f1d9…

MALICIOUS

PDF

113.0 KB Created: 2021-06-26 07:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dae2d071e815f17086a833c1b969fa79 SHA-1: 2f057c4cd6b9722b1330888d969818c46bf3c659 SHA-256: 9786dbd153b0f1d9b5433a157d62ddcfa4dc03cdc53dc13293275efadb2304db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/325ccfc8a196e5df0fd93320411202b2/nobaruji.pdf In PDF document text
    • http://www.monts.sk/upload_images/file/4844990632.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/99369855725.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/52806403112.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/14873695117.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d9dc0d02b---devavekejesujib.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c27127d77---27723600728.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160947612a6459---25266223345.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/liminiz.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/mvvsv3ajsul8asr5aj6jf0ibr7/sojit.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d584e3304ae---91034364823.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/larufaj.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/piguzuxafabi.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/27719076573.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/bie9bs0nl1doqepouppiqstt03/pafaguvedazujobu.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/81918625219.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/85973330660.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/29116631325.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6c211055---morupilowepewogadotona.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210609_150703.pdfIn PDF document text
    • http://rsst77.ru/upload/files/biremawiwefiwag.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086edc71cde8---17117635224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=international+business+by+francis+cherunilam+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_off000157e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E5 16896 bytes
SHA-256: 234952970b23642df0e9d717f75f4d2657afd5d5aa1c6213446ded15036dde76
font_01_sfnt_off000183f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C0D 11276 bytes
SHA-256: e42a433adbaad59bbee38d3df9ccf513f4300331a9dce39362fda780dd95b42f

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