Malicious PDF — malware analysis report

Static analysis result for SHA-256 df41350c2a1b3844…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 10:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b11475486119770338fcb8394dfb91d3 SHA-1: 116f2fcab1703be63f47b9263df4d857c26f155c SHA-256: df41350c2a1b3844226e23eba7ce36ae1df8794acc3ec64a578e0b675037de6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites 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 distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://meditopthailand.com/file/bebalafugi.pdf In PDF document text
    • http://saigonradio.com/userfiles/file/jebanurobuvuxa.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d4adc576e---87360086918.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4ad6c6721---jimakewifatexezorer.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210905195053.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210905155138.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/dakozojegolop.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/gofofenijavaxuwit.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/16339054488.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/raguni.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/913c4ef871f4b2c195fd72502e463976/wiwil.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/jogimimodetu.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/15755700447.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/97477178288.pdfIn PDF document text
    • https://siroyensao.com/upload/files/35277215955.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/47c53fb2e7de2d4ddf24dedfd6588e04/wonuje.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/nogovomovu.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613693db39204---8475955134.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/39971790641.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/bakobarezotariru.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/81102526101.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/52438108818.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/30729159343.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/91755951309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=camera+library+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEB 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_01_sfnt_off0000d5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 22232 bytes
SHA-256: a0e58ed0b9a495d4e33c17805c90b50d04a2b2fd35194f85e056fe7a43076a45
font_03_sfnt_off000125c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C3 10428 bytes
SHA-256: b1ccf544871c83b0f09b1666770ed9f0186778c1f6297d44b7552783858f01ab

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