Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f7eb0380135717…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 08:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c398f19eab24253702439a8626e601e0 SHA-1: 366aaa536c18e40a19f3d874ae1ca2acdd8151d7 SHA-256: f9f7eb0380135717fbb89da6de3826643e759d9efa3b1215f7b9e728a92ac0a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://drafthe.ru/uplcv?utm_term=anecdotal+notes+examples PDF link annotation
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142ab9273adf---33683754410.pdfIn PDF document text
    • http://sbairs.com/datas/files/gudamudetoxikovuferigoti.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/39069102708.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/9098604094.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/30636837433.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/53334211433.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///52239642687.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/saxibovujipafadaz.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/50555367237.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/wujulap.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139e7570d90e---wugamumubujikoveriwesu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e315185a8d80bc2152e9ca0577513d9a/gajemetigoxi.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/8711698862.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/10847201233.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/foritoduwagab.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131dbccc953f---lopuwuwewomaxirufuga.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/72433194382.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a40e0bb7bf60a539d70bbd170ffea17a/30090517674.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210905_281BC57D3BAC0951.pdfIn PDF document text
    • https://arerp.kr/data/file///84777370396.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/verobilakavewowip.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/derupuju.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/94937493565.pdfIn PDF document text
    • 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_off0000d926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 10564 bytes
SHA-256: 38f02a6edca258423410f60725c00e4181c13ed4b62a275b5b4a715c22a16036
font_01_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 17616 bytes
SHA-256: 7dc5dff695beb01d5676e409a6270a26523b63695f5d6ecc7bd27021430e459c

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