Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c56761e73fd90ff…

MALICIOUS

PDF

82.5 KB Created: 2021-08-18 12:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 488b9f9957c1e3c1eb0ad2acf0d36390 SHA-1: 343ac82f2a462a31d951cce545b33d44010434f3 SHA-256: 4c56761e73fd90ff7c7e576ed7e07e3979b32191d3ba030c0040ed57c92517fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicate a deliberate attempt to create a link farm for SEO poisoning or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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 https://birgatour.mn/js/ckfinder/userfiles/files/retigu.pdf In PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0aca59f0e19617d7b59a93531e33b37d/bofuduwirube.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/xejuwikupoxetuxabu.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/mivexukukibadagefen.pdfIn PDF document text
    • http://fairview66.org/clients/866114/File/38238269244.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/dadoboponegi.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/tabogegitovajojufap.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/68532859456.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84719deeed---77160835390.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/h5km2ah2oi4m3ijirs0ijl4h40/87753855062.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/fasazesudujususez.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/rinuragij.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/kevoxekowifudepubidirami.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951d42866c6---10417293691.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/xupagoguzokod.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/dupawagali.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/91893731416.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/12236750317.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c94e2296acc---suvikukifijajorotobebe.pdfIn PDF document text
    • http://envigest.cz/upload/file/78865922839.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/17578098552.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/78393236085.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/66100d4a0c767c334a81f04da46de091/4596220578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=substantive+definition+lawPDF 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_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 17112 bytes
SHA-256: 0deaca8b3770f97da470132e127c40ed3bc71ad0dbf0147e38e55adb59da481c
font_02_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 10712 bytes
SHA-256: 7f4e9cab9bdd35f695239ede7020f99170f94ac56b03da6a8046fff953087d2f

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