Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b6e17c78920b48…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 19:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5cf3001df1556600ed028a5a64427c3 SHA-1: d2741d0da1a21ce8bf7aeed0498352d7fe85d23c SHA-256: 12b6e17c78920b4883622d6eb321104e417969af82d073ab51e4194173e233d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised or potentially malicious websites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The embedded URLs, such as http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/27c0956bbbeb657d47a50d4d2fab588e/litiveselegop.pdf, are likely intended to host further malicious content or facilitate phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fashionflutters.com/ckfinder/userfiles/files/pomimuwula.pdf In PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/jivosubumupofagakawisu.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/sepezukuzipimeka.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae1f0f1a19---pedonuna.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/busuzaliz.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/82367240260.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/27c0956bbbeb657d47a50d4d2fab588e/litiveselegop.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/47657806976.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/6039888094.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/xuzawalaketoxus.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/39df2ace195190a3befd474fd4d319d9/miduv.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/48255396644.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/85735435024.pdfIn PDF document text
    • https://edarky.net/data/file/64418263036.pdfIn PDF document text
    • http://pronobile.com/catalog/file/vopiduv.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae23bc12e6---6519668392.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/dibijikuxitibatit.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/tesirekivikili.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/funofutagalafoxumamuta.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad50c3e691---65516271139.pdfIn PDF document text
    • http://novichiha.ru/pic/file/90526063524.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/6633769577.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/74292050853.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/mimaribigipezum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=minecraft+1.16+pc+apkPDF 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_off0000b39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB5 10512 bytes
SHA-256: e05788df521e80e99f1e4cefd78a2bf97d22988d91cf9ac8be0beb02cbcca42d
font_02_sfnt_off0000e3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CD 15512 bytes
SHA-256: d9f86b5dcecc737e4bf1cc33fac58079847e1f67ef8517b842d3b3861c277b7e