Malicious PDF — malware analysis report

Static analysis result for SHA-256 871363d8e4a51ab7…

MALICIOUS

PDF

72.5 KB Created: 2021-10-07 12:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e4ace710cfbecc3f8b32f6651fe6dc2f SHA-1: a30239ae004ae79758107d0cbc80a7682c11024b SHA-256: 871363d8e4a51ab793261ba6f627df7af5b039f741d8f6abeba4f215e225442a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. These links are likely intended to lure users to phishing sites or download further malware, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dobski.pl/userfiles/file/sovonowomag.pdf In PDF document text
    • http://doks-films.com/pcms/content/file/67026248883.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/zuvadipaboxubo.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/43228866406.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/93022166630.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/fujelasifine.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/73571038569.pdfIn PDF document text
    • https://angkalaris.com/contents/files/37059003987.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/jadujokabiliguwitor.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/74538285815.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/rifojil.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/fogakej.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed42bf17af---desavijurasuxabubaki.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e28e49592d---jokogigikosubo.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a0ad3c95c78920444c470dc8c4e4517d/sureraxovikugilekaxamawa.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/nuralu.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/71825998927.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/vanivub.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/10071282012.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/96906187836.pdfIn PDF document text
    • http://foxadv.net/file/25946822332.pdfIn PDF document text
    • https://funbugs.ie/files/file/maralojopa.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/83210977953.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56559164495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=hydroquinone+good+for+skinPDF 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_off0000bac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC0 10668 bytes
SHA-256: 6e266116160cd8a060c07f14d521dcf321925b174bc04b64315d05562bafe933
font_01_sfnt_off0000d2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 16364 bytes
SHA-256: 9ec29fb9d92b0b18590ebb623dc3299cb39db2bf8a23987ad9aee47d254c152c

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