Malicious PDF — malware analysis report

Static analysis result for SHA-256 403e9743d295dc3e…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 20:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2aacdf994aae570d94cc8a0e4ba7746c SHA-1: 76f83c274d24ddf2d864d6bd2dfbe3c7986e7409 SHA-256: 403e9743d295dc3eae40bcfccf2477a617303a9f5d32171e00abf67fc2634e08
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous embedded URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=olivetti+studio+46+manual+pdf PDF link annotation
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/10526772369.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ae11882e5a8---22442295214.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16125575be1d56---38089551944.pdfIn PDF document text
    • https://susta.vn/userfiles/file/dimekaxasaveduludegikoj.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/70912369370.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/59443280208.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba77baaf0e6---82831338509.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa692365b7---36002988562.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/595e641840a195b036c57a0a3ede6f8f/27236362546.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/44089734654.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/r3es4pij6cjn3b9h35kll0tmg6/lizunozegetujezisifevi.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-12/20210512122949306319.pdfIn PDF document text
    • https://turismoporsantander.com/aym_image/files/setagikitabumibiz.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4f1441f5ac51a7d9ae2817f53766f62/toxuvofijasilisagutose.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/novivukumezatebigifi.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/kepogipazojomatimidufebiz.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/midukirofapeveb.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/47924228709.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/dobogagimosugelede.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/kipekoropimuwugugakeg.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/24480988779.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107280042351525.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/teviligezumago.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/7737bc50cdfad3bc2b579cfda382876f/84297181333.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/30279097299.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_off0000c27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27A 17788 bytes
SHA-256: 32927b9958067df80bc4ce5b2c45203493f2e5ad9c31f63786763641b5b7291c
font_01_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 10996 bytes
SHA-256: 178eb8d9cee98f168480c655175ad0a59102aee844becceafbdf116bee6eb3d5
font_02_sfnt_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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