Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa040912456dfee…

MALICIOUS

PDF

79.8 KB Created: 2021-10-20 17:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d6db96dc01255ffcdb2fde6802a52934 SHA-1: c8adce89ea1b37fdb4dc03a3809bf4cf057d9d5b SHA-256: 8fa040912456dfee7f129a801f3b16dea397c4f2affeb75d8de6f11188b18146
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to distribute malicious content. The 'SE_INVOICE_LURE' heuristic further supports the phishing pretext. While no scripts were directly extracted, the nature of the links and the overall detection suggest it's part of a phishing campaign, likely using embedded JavaScript or other document exploits to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://elektromig.pl/userfiles/file/dowoxi.pdf In PDF document text
    • https://pabxlg.com/userfiles/file/wowil.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/zejumizejafivumonap.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/vokanepuwakimorunidexek.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/dituja.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/fejuguv.pdfIn PDF document text
    • https://webmenuplus.com/images/file/56837096295.pdfIn PDF document text
    • https://buyafranchise.org/files/files/26417191706.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161565c2111fd5---birex.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/96895763019.pdfIn PDF document text
    • http://mariancozma.com/_user/file/9278727981.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109240913409322.pdfIn PDF document text
    • https://pmms-online.com/assets/file/26969247126.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16167d909bc0b8---40822487664.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/36548398403.pdfIn PDF document text
    • http://letnaterasa.customreal.sk/data/files/91224946987.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/63511660016.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/91410158997.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/suterodomemuge.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418dbb373f0---54999219593.pdfIn PDF document text
    • https://jobtiara.com/files/files/wilepakarajugivuw.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/derajidobipalewul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BGAemAmcdTc/uplcv?utm_term=country+code+17PDF 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_off0000d374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 10244 bytes
SHA-256: cc77380adab8fdf8033130abd46b77380d19a539720ca2f54c3f2a5e3e2d0b15
font_01_sfnt_off0000eabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABC 18536 bytes
SHA-256: 3be502e7a26ed9ca40ee997bbe9698367996ef98d124f7d31b9681986ab3a7ad
font_02_sfnt_off00011a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.