Malicious PDF — malware analysis report

Static analysis result for SHA-256 0473a62bdb2e0017…

MALICIOUS

PDF

98.1 KB Created: 2021-07-02 09:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6f719896ba6117509c39a902ace5e3da SHA-1: 0755e7185b427965b50b8d14e27de45a3b3e4885 SHA-256: 0473a62bdb2e001730fd289bd9aa752e11a286f38cd21f02b7096c9c9053e71a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the structure suggest it's designed to lead users to phishing sites or download further malware, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9785

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://synerhu.ru/uplcv?utm_term=everybody+look+to+the+left PDF link annotation
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076324166ae6---31751250418.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/zesaxuxovowobe.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/pefumetabujefamuwu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2031a34ee---goxexogokovogopuridur.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7c6c55f5b---20898413122.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/40750844017.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/2faa51aa8233d36169424cd500f56273/vutiwaxozabo.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8d331e78ecf945e20d7fc5bfadd65c59/zomosuwiboremozetiza.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/riduvoverarozutekeb.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210624_4B59D94878FB9C9C.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/721168829.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074051e4d815---jikejaxadimedawajigekuba.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/16660052082.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/gatudulabuvuwasol.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b116b202998---loporubibekot.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/4915851436.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/lipopinu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160987dfdae688---delupa.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5440512a85---9012222393.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/zuvesifojobupiwane.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/tilik.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/53096201209.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68b487849b---jelegegurabusumexofaduxa.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608232c8c1587---dinoxunesol.pdfIn PDF document text
    • https://go2germany.ru/files/file/vesoleba.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 10320 bytes
SHA-256: b9ab7de118f086f2fa9b4c3d2114e9ed824c2a1936402a2f925e82a26e8ef89a
font_01_sfnt_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 11544 bytes
SHA-256: 9e0df0ac3182b995e854fa6a6143e6badf1bff0659b2c69d892a24b6db74628d
font_02_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 22704 bytes
SHA-256: 9a0a1b7d3733819c8ff27dd5f2690f958913746146e7e17a68b9caa48ce6a2e5
font_04_sfnt_off000162d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D6 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46

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