Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff30bbafc0e4a82…

MALICIOUS

PDF

84.3 KB Created: 2021-08-23 16:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b51e1a39031c7e27104cb4385d8cb2a2 SHA-1: ee0312a41fbc7dece32f4585e30cbbed750ce4b4 SHA-256: cff30bbafc0e4a82869930e4a2f5492ae66a49fe1da0febebf08d4bfb39798d9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the link farms point towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=estimating+for+building+and+civil+engineering+works+pdf PDF link annotation
    • https://karapinarinsaat.net/userfiles/upload/file/91552426220.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/tinotosifopozu.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/gawefonisibopowop.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f0aed6ff0---49948419480.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812d0a14a11---nonevas.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb9858629d---19691994413.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/29110621218.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/94359021680.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/8otm7f9c5h81ss7ja8ohn66og5/93979204594.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/98939525997.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/wawaduzigetekiginugozob.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6eae631b0b4df6ca51eb20930b4d2bfa/42323040138.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1bef6021c667dfe07a2b4aa59ecd5dcf/45354663141.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ea2f7dd5027a1592025c4589ae1a227c/bifufikolezunikirome.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e07b9ac9109---dozirem.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/733s8di1r4jnchtlqufs1dc5n3/94915688544.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/rukasedewulamunusodapam.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d7a6864f94---luwotaralaluvegof.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/98631594159.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160841c8b1ee07---welofiraxukafezureko.pdfIn PDF document text
    • http://maygiaphat.com/upload/files/kixatorikufifiwaf.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/medapuzilor.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/b4ef2c634403638e7d8e6b387c193b47/20888856536.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed2af09f9f---33934763520.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610a4ce5ec81f---vamimidiwuriroxekawin.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_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 11428 bytes
SHA-256: a8322deeefb65fffffa6f831d585374a81e71d3074d829c0367537d7bec7a756
font_01_sfnt_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 17036 bytes
SHA-256: 0ba29abf0e8604243ffedfce96416e636157548c1d3b1bfab21105b9c379a5ba
font_02_sfnt_off00012a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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