Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e3ef0c550e9db3…

MALICIOUS

PDF

87.1 KB Created: 2021-07-09 04:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bda061da64111471309f53dccbb7916a SHA-1: 4e57a817430845aac94aa2936fece611737ef3b5 SHA-256: 44e3ef0c550e9db39e564cd41736f8d8f3c4070fa6e55f1ab5fe3a2bed89091b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to various compromised websites. The presence of a 'Password-protected archive handoff' heuristic suggests the document's intent is to trick users into downloading an encrypted archive, likely containing a malicious payload, by providing decryption instructions. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092740b8b982---70327841536.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4smvgbv0f766bevn9s84c5pm65/38834352736.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c977989b1829dd9b78255914e36877c6/68273094254.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8f8a3166beab7baed4633a921d5bf934/77412585790.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8adc580d3---diregilujirodeziwefovug.pdf
    • http://aci-immobilier-douai.fr/userfiles/files/26038450401.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/dc8815b442ca7ebc2da675419a4b4c82/sexavu.pdf
    • http://arch-teh.com/pic/userfile/rofurifefazokirugati.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7abcf0d47d---28205009943.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9e71c1b59b2052aa860e29f7230e3384/ritijotonususufabozada.pdf
    • https://majubesar.info/contents//files/85538508064.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/rft9plkf7t24nbo1e3khhbamb1/21222353898.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0a12361c6853f498a01f6ca115269512/lafojufetosoramuravaxi.pdf
    • http://lawrence-spruill.com/clients/42275/File/xeditigirewapo.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f4f02077---45112141688.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a1790a84f---61215904835.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/bova9qhpommhtfvalpr9d9g9ot/vigapanamalubowef.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/17990440938.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a41a4979b15---fotorigiteperonofuragedaz.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a184dbd9161---wovominepuk.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608395b6b5fb1---86708738181.pdf
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/66673860373.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6223995f---49700475599.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4e33ef3f---xobewebawur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=can+i+merge+pdf+files+with+adobe+reader
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f06c.bin
6ffcc8890069afef8e77f29328007e4dbebd0bb3c9b317a9729bcde58f98bd58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 11204 bytes
font_01_sfnt_off00010a0e.bin
a861156af97a3fbc199cd435d15c667ba3a2b0aef69250f3868e5f85e1f28002		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 17116 bytes
font_02_sfnt_off0001370a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1370A 16792 bytes

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