Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e7a773bc6269b2…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 23:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95369f9c58c3c8097911f2d4d8e650dd SHA-1: 26bfa999561442a10516d335d6369f8ef5b46a82 SHA-256: 44e7a773bc6269b255da91dcb30fb9c01041a7a88d1ce415d061c0f349e5fe5e
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, likely intended to redirect users to phishing sites or download further malware. The PDF itself does not contain readable content, but its structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8f217ce2fd173bd6842acbe5b3c744f4/24085735352.pdf In PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/rakapin.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/janekon.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/1990001777.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/gonizoruno.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/38629159443.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/29648285827.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/66328411877.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/45953462297.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/76506032930.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/kikutew.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/89350143630.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/43856205812.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c924664f7---10095023053.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/51117535150.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/naxajifa.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/98683463561.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/pefetamurugudij.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210907_013203.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/ratiworowuxujo.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/witidug.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/patavonevusadituwez.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b32b4f1ea1---wonilo.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/2418913133.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/vedevoliguvulalusoxano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pirates+of+the+caribbean+streaming+engPDF 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_off0000bd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 17308 bytes
SHA-256: 90efe3def054de1fb880aa7d18e0810e0c78f2dad091ce25cec494863b5a25eb
font_02_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 10876 bytes
SHA-256: 9796ea8afa1b0ebcd67d85416e57cfb5b74f315040714d3dd388774e765f221f