Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdddf63fe669288…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 03:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce3276b9e4a3fc60a8950dad3d67e0bf SHA-1: 650453b7a536baa122239cae3effda42a6c93d1a SHA-256: 7bdddf63fe669288b745c33b3af97e4c0377b6e674de351a48973dc2ac9d72b0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://globalsublimation.net/uploadfile/files/vazuledamusaju.pdf In PDF document text
    • https://wita.lt/images/files/zikabufevalap.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t1741fbeppta536rhpp8ntena4/56554168993.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/fisegajuji.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905203524.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/wibenokipusenukorijawos.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5697_20210920013222.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/wanudajinidofif.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/35142937455.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614460b1a8fa5---jajipunupojolek.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/kajebokujalawexap.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/zifugufomumilavew.pdfIn PDF document text
    • http://master-br.ru/img/file/74067542489.pdfIn PDF document text
    • https://cathita.vn/upload/files/21663695080.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecdd632b69---zowipisuwotulire.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142d52cd5b49---mixigujubivixuk.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/juladulusexezekoduvuxo.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/38582370211.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/paweruloxume.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/20063910237.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/fubumuzaxem.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/xoniv.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/wivekapogozitoxivow.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/rexuputemarokabejezevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=shirley+caesar+no+charge+lyricsPDF 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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 10600 bytes
SHA-256: 78e915837af29016129a23c5b5cd29bf2e91e396f71a2068d01fe127b23c04d2
font_01_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 19100 bytes
SHA-256: 3f6ab4e32b1a4c473a42166dc19cab053532337e94c84972b5478db1d7e5e0ed
font_02_sfnt_off00012197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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