Malicious PDF — malware analysis report

Static analysis result for SHA-256 7966e75516d4b455…

MALICIOUS

PDF

98.7 KB Created: 2021-07-04 23:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f7f0e8bbbeb58bb2447289e5582ec703 SHA-1: 777a66b2698c773099ceee77c5ee43b0423e81f5 SHA-256: 7966e75516d4b4550960f2dc898a044a6df6757ad08bc57a6cfccb6cb9f1cf24
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with many URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The presence of a 'download button' heuristic further supports a deceptive user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/ddc7981daa36c28d967efb8397bd65c3/95015755954.pdf In PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90184c6ace---24538573090.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e02482c924e159579cfc7f93eb2129fb/gujikejewuda.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd3d2a655---92115182240.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/2d598b1682c9304bc258eebea79b6d78/54090418652.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a647022901b---dolujupibakugamij.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/4b2545daac69417eb97cb5173921d231/retumolafedemux.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/wodepalutujupubapakagiga.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/c14783aa2d6620e0e1d679f443c5ba38/zitikubon.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/logurepapogodikipukiwofoj.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/7b25b5d1c1939e41989d6794fc3b256a/36885791227.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ca57bc227---45729084628.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/97238775289.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a91d92c170e---geditesalawelexegobenuk.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf35bdc7d8---jokiwowumomijusuromosa.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095e180ee6cb---tubovon.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/suzexutakige.pdfIn PDF document text
    • https://dacsanmyhuongbeti.com/app/webroot/files/images/pages/files/fazelopizevuzeg.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/e168a2cad6495e700ca2c78bb26ce6ce/79110012457.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860dc9605f5---83768698705.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c982577ebd5---legozobadevejemerudazuzu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e03fd8c6cb69a0b0e9f8b4b71038adf3/xoluvazowevoxavofenatok.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/defolulubowogom.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/xefozenalemifozozilese.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/a607185afd45ae65b6dac025b248c15d/magenuwumikobolaneze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ost+frozen+2+show+yourself+mp3+downloadPDF 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
font_00_sfnt_off00010ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 11348 bytes
SHA-256: 2adf072f4031497ed04d4770469f9442fbc1329f0f98f0f8a68b88fd0d6f62af
font_01_sfnt_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 22916 bytes
SHA-256: 450fe1d7abcbf578771a7d2a6430dec2d36ee08541d776ea796f233e99e6c5c3
font_02_sfnt_off00015a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17297 2432 bytes
SHA-256: ddf1df4ff8b425b9506248f92526a661e44faa79d2affcb46891cedd3c436d15

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