Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde864a0d96497bc…

MALICIOUS

PDF

90.5 KB Created: 2021-07-15 19:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 01025b0d4fb5e431bfbfd97808bb0d36 SHA-1: 3562f05852c9251f7572adf26e4cb4526d0d95bb SHA-256: dde864a0d96497bc0ccff7fa62a6bc257f798b53defe0858258c59339d0b3362
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. 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 URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://catamma.ru/uplcv?utm_term=black+shih+poo+puppies+for+sale PDF link annotation
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ad3639cd64e04fc96a5af9c5dd0abfb1/jinawixosotegapijar.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/49939707675.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096531cae80b---29371321011.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/kutito.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/e241e656e2dddfae254792a7c640e278/11641615627.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/tfndgfqmuvs0o4qtb8v1602046/lemig.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/57833e66419b3d240d5e6d7ffe11019d/lizotazazudozuloboxowosa.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/wejavudasapusozi.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8a5a3628b6c7fc78c0701de47206b42e/ratevame.pdfIn PDF document text
    • https://luminex.pl/upload/file/tuvanixa.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dadupidugexali.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607378061592e---59416099415.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/5d1ff6fe209269dc8a109b59b5ba262d/56026765236.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/5cjcaa75g1dvppieu5toehupa6/ruferiviposanamuse.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/37d2f36d86e44d02f7a5284dcd971c70/vusisefusabuvalakak.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/43430744884.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b90850ba2---52103639168.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9c2743c70---8866468062.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/1137555466.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/43837863228.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160da9cd5bc716---93003745890.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d481af335---59745561019.pdfIn PDF document text
    • https://ottopianos.nl/files/makabuwilamop.pdfIn PDF document text
    • 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_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 10620 bytes
SHA-256: da6a25076ce871f3844f0e986a502d70bf9626eda3bf60121e1006c34ba236f0
font_01_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 17004 bytes
SHA-256: bb547634c0522ed5d0bcf0116cfd833aa81c17d2d9f0b9a4cc3cace27d97eb0d
font_02_sfnt_off0001430d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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