Malicious PDF — malware analysis report

Static analysis result for SHA-256 854ffcbaa5187741…

MALICIOUS

PDF

88.4 KB Created: 2021-07-28 00:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98fac7150c6ebed02d2793cfffb90156 SHA-1: 1cbd2408c458b9f9848800c67edf92b401e160d6 SHA-256: 854ffcbaa5187741be0b78a7c0a82f281180471f91251088bbea8dd6f46885fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec5a57030e---47447531314.pdf
    • http://ptaki.info/imgekoprojekty/files/tilejevifarofekaxub.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/l3eacu9blgj20h69574udve7d6/tabagenenunotifin.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/khp6adeh75b9b169pn8pouegn2/silojazemawosaligigu.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa99c312d4f---3541084002.pdf
    • http://a-daily.jp/app/webroot/contents_img/files/tabujofex.pdf
    • https://landi-bg.com/images/file/xebifaxaremadulefare.pdf
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/55963508611.pdf
    • http://kipia-nn.ru/userfiles/file/wilararujupaj.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5jp3tt6sa45qumf3023knnommk/7000219914.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082861e53a57---tobironibabemagibowepebej.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/np7bjtcnt7ept8u3gbn8v40jrd/64957998212.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/52d22c95d3bad035ad558a274a5fafcb/43675508496.pdf
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/29675491246.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/032eee33de83a7cfa80f356a4372dbfb/53592076772.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/37ca275ad069f8b4c07d20936afddc53/99490232879.pdf
    • https://privatecambodiatour.com/userfiles/file/44720348032.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609038b7eaacc---gofonikoripavazugidufus.pdf
    • http://artside.org/data/temp/file/baruligubun.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/2a012e640c2450bcde5804000b77f260/23767133947.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8a4c3815ce10aada329750387e85f84e/vimozoxolabivutorokijip.pdf
    • http://adabaskimerkezi.com/upload/file/50923009772.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1b77f525---23623733931.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cd6964fc4---50188929103.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/83e5010c25ed185431839ce1038731a9/54659563766.pdf
    • http://slenderclub.cz/ckfinder/userfiles/files/podozaka.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+hull+house+means
    • 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_off0000f655.bin
20765877b22c652d3a2b7161cb00ec92d0acb7737967132b2c0570d2148b3311
pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 17732 bytes
font_01_sfnt_off000124b8.bin
1318b6db242ba0cd8c325ce681fd8b45c29c206b7b4a41caac864cd3b619bf0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x124B8 10272 bytes
font_02_sfnt_off00013bc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC2 16792 bytes