Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace75c923eb7c34c…

MALICIOUS

PDF

90.3 KB Created: 2021-08-05 17:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3f9c98e5d113ef6c877cf878b3047200 SHA-1: 302773c2ffe2899b70c72b8a90c7e281d99092e6 SHA-256: ace75c923eb7c34cfb1cb91bb16e35eff6c2e1c72027b2487cfb2412fb3b2dc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. These links likely serve to obscure the final malicious destination, which is probably another PDF file designed to phish credentials or deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdf87c5a48---59904422907.pdf In PDF document text
    • http://thehigh86.com/clients/13680/File/putizasix.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/zedilanav.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44c4449bfe---1241830867.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607444c657908---lefopovi.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/66521514300.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2f26a03fcd7668a5b7e6cc453a85a0c1/46075537889.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/73422169562.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/tc2vg3la539mt2bs7q2ot8gi2a/69353227704.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/muwilupugafoguzila.pdfIn PDF document text
    • https://andana.us/files/files/ziluzumuduziguri.pdfIn PDF document text
    • https://area5srl.it/file/vanomidisusop.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/kanemufopekas.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/19750812999.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/g0ff9u2p4k5b67sj0ibnrl2tck/sedagopusubetid.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/182284388.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/xuwatoseximapesobixa.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/sozotadiminoferojodere.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/zofakoroximufeduzaf.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/dosezefaxetumefolodiw.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8869be738---66334316642.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/6c3e35d8c833985a1e0aaa5170335f2f/gifejope.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6977dd94823ee97f7f8fede8c7aece86/43819488097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=nikka+zaildar+3+full+movie+watch+online+gomoviesPDF 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_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 19876 bytes
SHA-256: c0f5ceba2ff9e818a4c8e4e2ade3fdab1a0c08136c893dfae0877f51c0aad9a6
font_01_sfnt_off000127f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F1 11476 bytes
SHA-256: 5f1e573ce1051477bb9bbdc0eba619076d7c84aa96d78b3e7ebe752ae8800c0f
font_02_sfnt_off000142d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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