Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd3cde726dad9b8…

MALICIOUS

PDF

75.2 KB Created: 2021-09-07 21:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bf8f7757d4fcd8d0ee6be12e3f5e3f1f SHA-1: 59e3f760a8e728138b957512440ff4fc2f07641b SHA-256: 1cd3cde726dad9b86a4c6fe777b4f8993dad9b8a2dae488fce8f5fdf40d55276
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The presence of numerous links and the nature of the hosting suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://dhins.com/testingsites/advantage_aviation/assets/media/file/9063904497.pdf In PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/fawazisuwuxekiru.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16131949ee6817---ziwar.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec0962969---92418526624.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/qg47fg5lg31ebr2fhbq7eoia40/59267394122.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/getopotorilegew.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/25610948925.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bffec0eb92---54775750012.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/25489374885.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/26439319132.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969623b6949---84010091291.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/53878179413.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/desuwixagilemojurufuwi.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/fde290195a582f5a8028285ab1a670b8/62492848267.pdfIn PDF document text
    • http://jn-zhsc.com/upload/polebu.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/5412899997.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/xekelunidatukebef.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606f074f4b714---97162865140.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4f0446fb5---zivujobisojaxaxotunapoj.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/zizazopu.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/kemavubukaboxusodewonibo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608048b3c90de---nijifajabusesuzeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fernando+sabater+etica+para+amador+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_off0000c13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD951 10852 bytes
SHA-256: 22fec5583b06f5cf279a0dfc0168d0d5b0c544fa7332314c525bf25852738a76
font_02_sfnt_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 17720 bytes
SHA-256: 9335520834e9687ef0d66451882078b8f80520248b338241faecfe422995a82f

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