Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a872c6e31f1c355…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 18:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a6d9eb7af1803e43038e962bffe5051 SHA-1: 7f2454d68d74200ad87ec8073475951ec597c760 SHA-256: 9a872c6e31f1c3550f582bbaf4e4a385fddfcc1ea8001e40148dcc0a209590cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised or disposable domains, designed to redirect users to other malicious PDFs. The presence of external URIs and a link farm structure suggests the primary purpose is to direct users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://jucal.es/images/file/90894492523.pdf In PDF document text
    • https://actorconseil.com/files/file/5147245480.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/99b059da7e9f589e0c2f169a7cc8f0a0/10231119410.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/6macfv6rgmesf237gtumauirm1/35825571549.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870c7bdd6f8---66485942582.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cbc159fb5---gisetek.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502145313920086.pdfIn PDF document text
    • https://fultoys.com/userfiles/duruburujaruzeja.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/62835c63abf8837f228fbc26f45ccdff/82339331125.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/detisebepem.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/gaargo68flh9773l0c7b1257u2/86156398516.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beccffa3976---nusefejupasoku.pdfIn PDF document text
    • http://brenderup.ro/mm/file/5591053668.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8942a6288---fimuzerulimesukobofetenus.pdfIn PDF document text
    • http://czapla-dachy.pl/public/images/fck/file/81805598867.pdfIn PDF document text
    • https://webhosting4.net/media/file/mikudukina.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/27813056866.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/vilijodewodotal.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/lalitapakujorevaw.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/kabewesulojotute.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7cef857ae0816da1024b9a923528d090/lijujat.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3b8c2eaf---kibefebej.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/98066974354.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/rimogekemiz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609010c9f3e22---mupinijawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=radio+telephony+pdf+downloadPDF 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_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE58 17888 bytes
SHA-256: a63934e99e0a9b40984f5bb8a58d52d8ec51c299b8ae115822120caa45fb6af3
font_02_sfnt_off00011cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEF 10572 bytes
SHA-256: 560935b5a7f56c2f2b31a87665718446471f8211e8c55325bed1b5bf752f3fa0

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