Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf33b4ab8a48e87…

MALICIOUS

PDF

89.0 KB Created: 2021-09-12 12:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f989d9b456815b39b587f0fe6ac734e SHA-1: 99588dff8e1dc63dabd4252b03b0c322eacd48c6 SHA-256: 7bf33b4ab8a48e872935d28a05ca7384a9f25b9b81195485ecb3e0b6bf385090
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm, combined with the presence of external URLs, points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://biplano.eu/userfiles/files/37332059002.pdf In PDF document text
    • https://kocarbon.vn/luutru/files/terav.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132452653589---gojizemi.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/78727458550.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/16590425087.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/61117666756.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109041704068685.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/1690895020.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/mexusarupuxu.pdfIn PDF document text
    • https://brs.jo/userfiles/files/89605867945.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/33817107857.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/82899456902.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/34082478511.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/sigasuzulaxixexakis.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/91244505221.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/mujuluniselotuxonufit.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/nutebejazadiz.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b74699c574---96442001444.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344c40c5d0d---7446996985.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/fiwinigalomosadetetej.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/97198533342.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/rusetizuzevofev.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/kutuxufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=malena+movie+free+watchPDF 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_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 17596 bytes
SHA-256: 8eba1fad6d111de2baaf9c06b4515bdeb8291468f465da88d8115a6459e52e3e
font_01_sfnt_off00012640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12640 10576 bytes
SHA-256: 5e28d7d664c654e653354c34d64d3b61d2aee2f5ed9584b74331a91e389ccd22
font_02_sfnt_off00013e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1