Malicious PDF — malware analysis report

Static analysis result for SHA-256 63978b6d44661d94…

MALICIOUS

PDF

74.5 KB Created: 2021-09-24 07:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b6b794604e78ab914f7857e96726ec1b SHA-1: 8aebcad5d5b9c612132800cdcf9d9eab4d0c728d SHA-256: 63978b6d44661d94c014d7ac5a836943e8c635ea2a423f411880f9f859bc1cbd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=rupaul%27s+drag+race+season+13+watch+online PDF link annotation
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161487c62888f8---22018234836.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/4560897146.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/lirekiwagifamuvu.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/36295805592.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/47703766699.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/57368911687.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/pasevilopuruwowumuzu.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/mopaxusunida.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/gosobu.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/3254860375.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/dizatanikilajowizomonuvi.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/40676541505.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161300eb619a1f---womop.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/kobalosapeb.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/liwomafejikubud.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/bulalovinav.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/34553802150.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/maxapirulaje.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210911174956.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/zamukanolemogapa.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/64182967683.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b6321ccdd962d680d6c61021ef92d5fc/pabaru.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/xozogofisawuj.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/kekekovikesifutisem.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f889aa7d13cec42b3370c878c037ba49/73126866861.pdfIn PDF document text
    • 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_off0000bd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 11284 bytes
SHA-256: 2667025ceba8ef7cfb93852a02f08e4a71fd0b36e168f1a0018b3a1e0bb97290
font_02_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 17012 bytes
SHA-256: 689a92974d6fca548a1c963fd04c9020a6c011c4605341cee009042447fb58ae

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