Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7f668cb73fcdcc…

MALICIOUS

PDF

90.8 KB Created: 2021-09-01 22:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 422da69dd5c4938a5c9b0990258f7ebd SHA-1: 06fd897a783b6fde9565af2ffa333976bbab0c27 SHA-256: ea7f668cb73fcdcc6f9854655e355cb404fd08ec2f571c1285fe2daa8fda149b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to potentially compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous URLs suggest a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://www.guus.edu.mn/ckfinder/userfiles/files/mepexedeganetuwotenalanom.pdf In PDF document text
    • http://espwireless.net/uploads/file/76165171277.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/295019238.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d32de13c---melafakobuvonosos.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a477e5913b1---24080161952.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/revilifamibaweragerovu.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/45490763579.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/68718522212.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/11941695555.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/fikit.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160871872e116b---mozofidoz.pdfIn PDF document text
    • http://kag.fr/userfiles/file/48961101967.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/25101967012.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/20532358335.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/63758066692.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/lunov.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/89760227189.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/95342065945.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/19449275973.pdfIn PDF document text
    • https://mauspro.net/upload/files/lufatekitupim.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/m80oqb0vepkjqkd07o0hlpkr0j/2548388058.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/lijetasipivarufokajedom.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c031e3a0160---97196636785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sad+face+text+symbol+copy+and+pastePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A2 11020 bytes
SHA-256: 41026b3fa16383fb88f3dd9106e3391524b1b5f96410d2e0a818074668232c8f
font_01_sfnt_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 25960 bytes
SHA-256: 0f0bf395fe37445d54539617efaf6a83104ec400e020d380c3e9de086d4f5fe4
font_02_sfnt_off00012d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000145ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AD 16500 bytes
SHA-256: c8114bc93cd50dd4a8374361ef8a460c401d5381efcde86c90a540bbaed4bf13

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