Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc74350b5e0b29a4…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 02:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89fcf3ef56f7f9f055a5750441b58ea9 SHA-1: 6cdd52359b7f99c55fb329d76a1d07fa80c53f77 SHA-256: cc74350b5e0b29a470c87f2576c4369de1721b23052cb70bb429ceb3efa3ce86
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://dainichiji.com/upload_ckr/files/zowogaf.pdf In PDF document text
    • http://whewfamily.com/clients/12004/File/fuxujofosekakanirafel.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/76773382892.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/guzumefexewunobi.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a8decae31ff---repaxirip.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873ea11da04---34760725054.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161212bd185881---judizidaposinositixap.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aed0bb9914---97142579518.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/91086578031.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/pokovof.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/20628260318.pdfIn PDF document text
    • http://arablift.net/userfiles/file/povakix.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/jurmcrneq76hglfgb5gcjht9or/sorevizut.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/xewuvirotodugup.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2d64dd16---miwovukezofezu.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/a3f48340fa4c0d053984673a52b49089/40584431051.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/vamevetupamoxidi.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16075d04a489c3---nitorewefuwabasitefesan.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d63d7c7289e230fef3bb9e76d02df8f0/fubafudalikadiwajes.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/ginavogalosukuxekusanu.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/nanojasefewegobawemupu.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/28617309350.pdfIn PDF document text
    • https://cooperspick.com/files/teruviraxevuxekesigojiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=weintek+mt8070ie+user+manualPDF 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_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 10712 bytes
SHA-256: dfcc0c0425a60aa2417b72eb144e085bd8f60974a550bf2ffe72cb06f07b8fd2
font_01_sfnt_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 17992 bytes
SHA-256: 551138d805e5da536f6d03b046216a7a079e46c85e5de608031ce0143a7a117d
font_02_sfnt_off000130f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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