Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f977dabab7ce9f…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 04:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf1474f4408a11dacb9b8b3210fdf80f SHA-1: 5eb02f5fd40bff5001f6b9d5f18b8619f9e74fa1 SHA-256: 95f977dabab7ce9f7a5d71cbf8edbebbb4ca05f108e1209876993071ecd89e4b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the malicious destination through numerous redirects and potentially SEO-manipulated links. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=drager+savina+ventilator+service+manual+pdf PDF link annotation
    • http://samsung-service-center.ru/uploads/files/tozigigupelixod.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/zoberedi.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/90221599565.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/5bb4810bfc050b65f3853396d4380a78/vukitotun.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/vimizorobid.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b042d673348---37932646869.pdfIn PDF document text
    • http://boxethai38.com/upload/file/metuzuxoneredamilikoni.pdfIn PDF document text
    • http://jsdarvin.com/files/77899238294.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7d43ef45413d50428d5133c6adcd2f60/38488072484.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/9379639509.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/89682608961.pdfIn PDF document text
    • http://voijin.com/userfiles/files/9820789248.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089f6f1b2939---gufinedi.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/befige.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3b92fa27994f13160cca1edc3bbf6ac0/zagovanawiduketiboki.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/zejapiza.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/gexorunetuvixefus.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/37757032485.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794c0d2f3d0---16444043942.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/71c7e4afd865c09ebbeb434fbe38265d/lozaguweserakibaduda.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/kifosemus.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/42965739537.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/53387126108.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/digepifuzoji.pdfIn PDF document text
    • http://planetamama.ru/files/file/45736897188.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_off0000c1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D8 16516 bytes
SHA-256: 9c69d3f2804ef3680dacaa02a19b59f1425e3b5edda8eeeaf12ffa040255f398
font_01_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 11132 bytes
SHA-256: 23e63edddea3b73f992b35cfaa32862f30b7d35c454c1dd0d3af7400b71d6583
font_02_sfnt_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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