Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee0ef943aae67cc0…

MALICIOUS

PDF

74.5 KB Created: 2021-09-13 07:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5ab58fed0df4b11b542149998afd541 SHA-1: ff3e43b4e1b01cf2456ed37acb55062c1ff1f7a9 SHA-256: ee0ef943aae67cc09866122ae7f3ee5514a64d91bbb228171c9045369df502b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://samtle.net/ckupload/files/77327371262.pdf In PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161346f20e33cb---vekapibizazotunuwebaji.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/mosumizuzokinulinuxopilev.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/36768277640.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210902_AFFBE74C2E41886D.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/lizas.pdfIn PDF document text
    • http://gr-chem.com/upload/files/navitane.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210907045821.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/xewidaludipuk.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/3265715110.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b0b20d7c8---ruxeni.pdfIn PDF document text
    • https://spyboarcams.com/files/74255065824.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/tekorexomijaxefam.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/wekuwafadoba.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369c1f1445d---nivujanamipibifuro.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed7b7aecaf---35266648929.pdfIn PDF document text
    • https://jensbrode.de/files/file/tozikoserikojevumirimuwor.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/36613509308.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/lifekuxu.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/780963927.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/1969694598.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613021804c096---68133466865.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/t7r74sj812vvuoi29f9eg4dbtj/86005201457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fortnite+apk+download+for+unsupported+devicesPDF 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_off0000bba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA9 10936 bytes
SHA-256: e30e80db51b489a0f186911c07910d3796d163cbf64c74e1e17fd3e72d60ae3a
font_01_sfnt_off0000d52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52B 17692 bytes
SHA-256: 876dc327fe8f07c15cf8160253593aa3f18ca1593359e5059dd7a5b63d1770cf
font_02_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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