Malicious PDF — malware analysis report

Static analysis result for SHA-256 03027819d75c9c8f…

MALICIOUS

PDF

102.0 KB Created: 2021-08-17 08:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a52775886ef0f12f11ff34f06867d031 SHA-1: 6bcd2908c7b56eb055950c13f425c708d2cb6bfb SHA-256: 03027819d75c9c8f7259fc6b7954ca39aa85ff1f88cef3bb6d8815db3e749e07
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised or disposable domains. The presence of numerous PDF-specific link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://www.umadai.com/ckfinder/userfiles/files/zebumawugosibituxirevasoj.pdf In PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/e1bka9ikanierq6buhf58skr4i/12056821257.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/wodavevetedud.pdfIn PDF document text
    • https://sbufficio.it/file/27748595189.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/b16e2e9e910e4569f05878dfbbd67d61/81671130669.pdfIn PDF document text
    • https://strechybenesov.cz/content/muzonivezi.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/4020141701.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9a7bdadd4---45566016914.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/o2ago3r6893rk04nupri24nuv1/rajininufebo.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/98520638332.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/lavezimunifudu.pdfIn PDF document text
    • http://soc-in.com/data/media/files/peloviw.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/118dda55ea75d05bffef115590254094/69621672618.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160790faeab825---winotiximemewofod.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608b57d74359a---78487487276.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085257074767---84264813597.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fce28b438---mitukusawid.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71e5271bd---sunilipopikigep.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/bavixujaxapebadizus.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/81099710004.pdfIn PDF document text
    • http://cosyromania.com/media/file/56331740106.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16095b6e30a432---wopakomenakaxibexi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16108ab421ee9a---julodonagemadolakafofisod.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d09991117---kimat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=a+cuantos+centimetros+cubicos+equivale+un+metro+cubicoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010199.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10199 20296 bytes
SHA-256: 6e8862543a5d2e6fd6f82f999ad22a38e8793c68fe6350835f004353e6fc8d42
font_01_sfnt_off00012467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12467 19760 bytes
SHA-256: 3bea45182c952fddcb5bb82a17664ac6d79ddfc0512b3c41318c77dcd4582544
font_02_sfnt_off00015670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15670 10824 bytes
SHA-256: 6bc4870114a314ea6bea3e09d0bfe95a1d2ebf9c787747ae96d508548438e1d0
font_03_sfnt_off00016f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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