Malicious PDF — malware analysis report

Static analysis result for SHA-256 12663d910e37926d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 05:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f2739159c7bf1943ed33a638b6085eba SHA-1: 908f0b39b175b83a6b812cb01f85999e2dacb67a SHA-256: 12663d910e37926d96811e41e9efee08b0fd340fa435f7079a3ac237f1c606ab
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The primary goal appears to be directing users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://universalgroupautos.com/files/others/18449723402.pdf In PDF document text
    • http://teamhead.net/userfiles/file/87714398351.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/pakorirawokoxefuv.pdfIn PDF document text
    • https://le27.fr/docs/file/84290081670.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab14542723---wuxilura.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210906_054146.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/88690437566.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/rixesakew.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/741f0004fed161cb84d14d57b1b57175/457803488.pdfIn PDF document text
    • https://lecachet.fr/docs/files/99513793722.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3df11c64b43b06059e2cc14682c9f221/75302473568.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4c9b97a7---36399543792.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210906_202308.pdfIn PDF document text
    • http://wohingltd.com/userfiles/85756062475.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/kuvoxomo.pdfIn PDF document text
    • https://shibbirs.com/media/files/58778400989.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/pirafegaresisojekar.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/43901353725.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/46001334159.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/sever.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/65964631618.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/51386322225.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/nefevexagimeseb.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/dedax.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/bumimozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=internet+permission+manifestPDF 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_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 18308 bytes
SHA-256: c7e48dc5c948aa51ac3dae749dc77baa44208103f3ddd6b3faf38326998014ca
font_02_sfnt_off00012829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12829 10424 bytes
SHA-256: ad7553642ed4fb3e04d5784ea6ce305b8da743ad5952970920396e62dd4b14fa

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