Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a82b46ee225a262…

MALICIOUS

PDF

89.8 KB Created: 2021-08-24 17:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1b45488e550cbda8ba6aa21ceadd2cdd SHA-1: c7cd41579b14e94e78877ff3a177475a9f7cc2a7 SHA-256: 5a82b46ee225a2622ef20c9f0402a5633e71c4565da14ec1cd189898011026b6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://miaousland.fr/ckfinder/userfiles/files/8536936343.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3v8kaft8hg6neo9m0artb8vcg1/6287606730.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/67225a3b0c8044af9877ae497711c162/taxubopololakokozafezuv.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e4a730e96---doxudokexupexidufabepozi.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/furefowewilenodimaju.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/16675484368.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/64683777237.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4400b1eb9---gamafirasam.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16117f6867ebde---nivodagonuteseganekaxev.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2aeac7fb---96630940382.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a1ece4706---33129273895.pdfIn PDF document text
    • http://bonsaichik.ru/images_uploads/files/gesakisopobogamolinazute.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/notaxojazemixagibalugu.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/52195931177.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609414a344c12---gitirofovitufom.pdfIn PDF document text
    • http://greenld.com/userfiles/tizazinaka.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/41308499419.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/de2efa116bb0030ae3c3c650f74a879d/81132276234.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/mofizilubole.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/39306024446.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37349ba260---84983954433.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/bofagunu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3cc1031302ea7b74c65099f771f9353a/mogunenisazo.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/wosinowiletivaketajeri.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2911216c1---91687008325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bjt+biasing+problems+and+solutionsPDF 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_off0000e1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 17200 bytes
SHA-256: 6e61ec5a242d1ed33f6e8f3a8b1d2f3aad15b522f3025fc67609145d9578c8a5
font_02_sfnt_off00012406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1D 11156 bytes
SHA-256: cc8286af0e202e52022d776351486b89f2e3fc2ebca075afc62b5f2130cd4cdc