Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6b30b20a85f928…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 23:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5870f0d3c872594cb4f9d88c422b1c98 SHA-1: 0605c644d02679ca6e761f62a30d9cef6fa22e8e SHA-256: 6c6b30b20a85f928516ed282016da1e7c2cfa19acd57c897944f1761708750c3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The document body is heavily obfuscated, suggesting an attempt to hide its true purpose, which is likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://gorisum.net/fckeditor/upload_file/file/66200432165.pdf In PDF document text
    • http://thuexe7cho.vn/upload/files/53559814229.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/gatipagibufipenuti.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/e285bf274632b2a31a7e9b2561c5b88d/30327514030.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/9351617579.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e742f169d6f020e7d14db8d0bf98807d/vidizosatepivaninovizubi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160926f0251964---3923208800.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/77742354347.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/lomex.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/79032699832.pdfIn PDF document text
    • http://unsersohn.ch/images/file/1506147998.pdfIn PDF document text
    • https://langumeistras.lt/i/File/79293479549.pdfIn PDF document text
    • http://jp-cable.com/d/files/mijanuva.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/tuwukav.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/2h21gbisee6nijv4chqhggnkrg/90936305065.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/dizoxig.pdfIn PDF document text
    • https://ancoraeducacion.com/images/zubonokoruvamomexakovabe.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/bogimosigi.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/66976299270.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/dajugufogulurolurup.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/16634011746.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/270c8c47b4a315bb8497f444323a9f3d/genireko.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-8/file/mubonigafejodumupebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=convert+tamil+pdf+to+english+onlinePDF 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_off0000de05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 16572 bytes
SHA-256: ebbef7223be1e64300a074a7eaa8c5dd5348388458e8b2cc2c29c98c0937db7f
font_01_sfnt_off000108df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DF 11040 bytes
SHA-256: f2d0cc7eecc020be11aaeaec9499e5c135597d110ffc830be2ceb2c41c44b71f
font_02_sfnt_off00012236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1