Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4134dbcb42eb0cb…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 19:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f5762169aa234984eed07b323e3653ad SHA-1: 7402e888818e596946af8973f8d16e5dd69a6c82 SHA-256: b4134dbcb42eb0cb6457a7d7a28fa90e86a3c9affa9bf723e032d0e7c7acb57a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to external PDF files hosted on compromised WordPress sites and other disposable domains. The presence of these links suggests the document is designed to redirect users to download further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://smilepaper.tw/archive/upload/files/27285654124.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7713817ca---60633525774.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160771ea0b7fca---20125393679.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/cafc9c2f940c35b27051dc5e0fef5519/87245483328.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/risonedirojezifi.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa13b782912---76878193955.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/664794246.pdfIn PDF document text
    • http://jngf.cn/files/file/welexofewokowizi.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b304dc071---kagata.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/56950210707.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807ec1b56c2---dewiwujunikutanoripawam.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/75333780939.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/vejirijifarebifoxusiwuni.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/zotogef.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tuvukix.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/4b4kd07h8mb2g2s3e0sbon3hcp/27895820215.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fa32d3d4d---82693522115.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8dbf5bf29000e9a048cbf57f79348b20/gajuwutixatup.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dmmlpud57jqhnm1plbr8tmdqg4/zonomiga.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/rl4t4jeadusfjssdv6oo5lcof4/25827229971.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/pojipukorovivifawu.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a06fc45f945---14684771513.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/90054372045.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160caf86a02595---78723000158.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef58c5bdba---36779349868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=payroll+system+thesis+documentation+pdfPDF 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_off0000d502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 11100 bytes
SHA-256: d495b2654b6f7bc1aef8759a9292bd00194540194a32411ad2a39970943a8a42
font_02_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 16660 bytes
SHA-256: c759ecae3ec395b1411d09c22a7333090203c826fe76c3a54b49ea64851b8cb4

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