Malicious PDF — malware analysis report

Static analysis result for SHA-256 4685a74396230fbb…

MALICIOUS

PDF

88.3 KB Created: 2021-09-06 13:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a1e30c03ff473b6e0adab134792d732 SHA-1: 6c36cfcd74f73f7326cdf2dd13aaf1d737fbec68 SHA-256: 4685a74396230fbb13de642b4c2756f6079415f1b5518a5ebc0959eedad3e059
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised or disposable infrastructure, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. ClamAV and the ML classifier also flagged this PDF as malicious, specifically as a phishing or trojan variant. The primary function appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b972d55c7---96015974068.pdf In PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/56495051218.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/ralifamepuji.pdfIn PDF document text
    • https://edusfera.pl/upload/file/55812846975.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/30211807396.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/24744167963.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787ebb3caf0---13645601657.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/segufijazesekanom.pdfIn PDF document text
    • http://lu67.com/clients/50962/File/32053193006.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607447559ea20---85464182695.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/juvifo.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607280126859a---vogavemopama.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5836851881---watoxuzitukikikegukomuv.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caba09d67d---2921716098.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d15853c8550af9406b578f4066344fa/29916819048.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/jokusawi.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/97963715499.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/71922666544.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/21380983542.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210510085330.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082649cbb55e---loludonapatetoxakubolaw.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/ua6cobv78rv0mi70ml4sb3bj7m/radevijakininukexev.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/88100744659.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202108021906184263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=electro-optical+imaging+system+performance+holst+pdfPDF 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_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 11196 bytes
SHA-256: 0820599fb4948902c95a04cba7dffc9e03d580b450e3949a97cd4b6d827b80bf
font_01_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12196 19024 bytes
SHA-256: 70d6a06c0293a78554c4a8923a77bfe41947c3fc9371daa19699122b0cd5474c

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