Malicious PDF — malware analysis report

Static analysis result for SHA-256 847ef968f0c790e8…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 10:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d5734c43706fab6c0356a8c6e82f81f SHA-1: 342c1b4ea980a6b396285e5b9e30bc7ab2da0289 SHA-256: 847ef968f0c790e88701ef2ebf4cc82a8555cf4eea98669ea30a4cd5640921ae
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting. These links likely serve to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://smenergy.kr/uploaded/file/183403462461218f7f0a636.pdf In PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723d63e0dc0---88973419088.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/64260277373.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/n1ffom3j8oupv93ana9q0qko1q/fekopisowije.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/20769537280.pdfIn PDF document text
    • http://bienbao.net/uploads/files/96131744942.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/pubuvapiputaz.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9853968f7a67576cbcad837385a45a83/66574060370.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/bakakobawuwelevegilile.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/285df4e987cf4acdabae634cc1b0bb15/xijavepuxogokuxigudabef.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/99384692433.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/26555750023.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e122dc07bd---41003820514.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/rafawesegu.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/34601845624.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a26741075e2---zopimeleguduvaxibajimepif.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/26894693229.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/fufojepegewepobu.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/kazisiwopexibiwadimafa.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/29850699154.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/nqno6fkp9ea1dsmka5vjedvp2v/80055044450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=lincoln+electric+weld+pak+hd+owners+manualPDF 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_off0000c7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 18260 bytes
SHA-256: d2145a45cf6a8741275a9a262af4f1a6fd8f8b9d7c1a488e6c478b8b06077124
font_02_sfnt_off00010f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 11016 bytes
SHA-256: 07e1fa308807319a203993f379e41625709a0fa7dca74f4d8734a704818a3f20

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