Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f14fee9f3a1ad1…

MALICIOUS

PDF

100.1 KB Created: 2021-07-13 21:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 43cd39d0e4212c7de09729705f8cdebd SHA-1: 83a8845f74ff513041a522b9ee9537809c4fdc58 SHA-256: 74f14fee9f3a1ad18170a0802c4fbca31236d92a4b2946932fa301dbf413d350
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious and exhibits characteristics of a remote-support tool lure. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of the user's trust to install unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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=famous+scientists+and+their+inventions+pdf PDF link annotation
    • http://www.companyforte.com/imagenes/editor/file/49419248631.pdfIn PDF document text
    • https://sca-kc.org/scauserfiles/files/37571732341.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/16839237163.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/54867767233.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/83019386339.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1067701e2---76816343021.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/b8a98f80c915b99458c298d4e42bd3cc/1526003747.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a162083f0---37237445413.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/ramirebafidimipizut.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed65cb1f95---69012783304.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/53772514703.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/02/nuguvumi.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608305f10b57f---kumuvexonixiguzavoxolimu.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/52292003154.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/46276316868.pdfIn PDF document text
    • http://e-sportis.com/images/upload/61458959945.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f2489813c---11805701488.pdfIn PDF document text
    • https://nadamasristorante.it/file/penepepuvos.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/js01r4nm1jpmuj7cejse7fc0j2/68472344815.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60dcc9f8ed0df.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/vuwisiw.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/l19b57rviqhol1d5gatuif22tf/xunomo.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_off0001231a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B31 10980 bytes
SHA-256: b2e698e93f7ef55571ee28475157fad1fca9096751d00f19a5866d8b2a88f066
font_02_sfnt_off00015481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15481 17224 bytes
SHA-256: a0c3d3caea298c6a4c91211338e7cd33ab83072dfa925511d4ebeb01069a2c31

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