Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc171ce7ce5e6349…

MALICIOUS

PDF

111.0 KB Created: 2021-09-01 08:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8dfa5e3efd4163621013d5bd0434f6d2 SHA-1: 3be023d25edb2c19b5ed492b7538bab7790d49e0 SHA-256: cc171ce7ce5e63490d421917f1a6da3607ab2ad284710392942a832d5ee22c85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised CMS upload directories or disposable hosting. This suggests the document is designed to redirect users to malicious websites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=man+of+the+family PDF link annotation
    • https://masihpt1.com/contents//files/23658975620.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/suvisemekod.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/menojufumuxabifudijila.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/39093053735.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/dizuzorajasuzafefuv.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/60327513949.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/5273366818.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210718_94DCA636D27F9E20.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210806094841.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120f2b8c2836---zexapufuno.pdfIn PDF document text
    • http://airfa.it/userfiles/file/zasemi.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/b89p8ed5escihonf9s8fskf3bc/1468508536.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/xijof.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/30605697677.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/19018b7f87326a67804ce5f9621f5cdf/30999613050.pdfIn PDF document text
    • https://asiajitutop.com/contents//files/46906211112.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/b840fb05f627e587108160a2366d9913/rebigimixibumidagagoz.pdfIn PDF document text
    • http://askort.pl/Upload/file/jupojoruluzetu.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/82205191213.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16092362c08d3e---vigibejaxakon.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/36cb1dfb70790cbbb20e3dd775eaba25/2615456990.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/zimedogidokel.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/35536397949.pdfIn PDF document text
    • http://sgpeo.pl/users/file/72027059242.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55337584147.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_off00014bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDF 19768 bytes
SHA-256: 0ce38b7a0369c26ef8dd3968631aa99ce216f243d428607d90c6099f92786d9c
font_01_sfnt_off00017f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F8E 10320 bytes
SHA-256: 188d4fa3aeb93fbb146ed51a6239f9bf281f3b54c36b7d89a390a703c4494605
font_02_sfnt_off0001969b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1969B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1