Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7962153a5f8428…

MALICIOUS

PDF

127.9 KB Created: 2021-06-12 00:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f47bd02849d80fa281cc0fa78329f9bf SHA-1: ccf284024c6b86804650628be1c28a7da16fcdbd SHA-256: bf7962153a5f84286c2d65466ee92e795a7b2406b75aaa535534879eb51f325b
136 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites using the 'super-forms' plugin. The document body, though heavily obfuscated, contains text related to movie downloads, suggesting a lure for users. The ML classifier strongly flagged this PDF as malicious, and the presence of external URI heuristics further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://infrive.ru/uplcv?utm_term=chal+jivi+laiye+movie+download+1080p PDF link annotation
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/53ffaf304df3e0aac65c24cdf4c8df15/gebuxijugudenopet.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/edjvkcmdulep892drvasrb07s7/16789513106.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709c18707fc---97871829451.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/cafoq3gesvljsdk5tniaufulhg/91138338905.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/5b7212bd01d508f22513e83e18977db3/33393271292.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/o14d7nosco67e5ntergk2vnld5/sevokajawivusaluziki.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070399a65e6f---degefupudumupimu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722be0cc5e6---pusotodewinugobifi.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/al6ilam1as8jbo2fi7nhgpgun7/laloduwilikat.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea49329678---73626006160.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082ea059d492---rowukegeminuwufegupexap.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/9162168266.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/acd9fc79d8f04e229ca900cc3b6903e0/58108220686.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/d226e0629856098804c796362d46ae73/26552161375.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/37869dgaabocvks3h2ta9ivsan/bupiruvujitofoxu.pdfIn PDF document text
    • http://escolacaritas.cIn macro / runtime command snippet
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001ba26.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BA26 18852 bytes
SHA-256: db8ae4126c9c2d8e865df88215b122c0cdab434ee3ef37782e39caa7346a8e3a
font_00_sfnt_off000145ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AE 5548 bytes
SHA-256: c88d8520e1e2d8c88d6e20ec0462d8ee36a87e13b6f6d9940c05e0e59b8620bc
font_01_sfnt_off00015881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15881 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off000163e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163E2 8176 bytes
SHA-256: 42126fd27b4bc0127c332da84cafb1bcf48600b1bc404537a63b966830e3b06b
font_03_sfnt_off00017e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E64 11392 bytes
SHA-256: ca1ee33be623afab59443b92cf165468e5c35f1702c5898df0f0566e7b8fe851
font_04_sfnt_off0001a558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A558 16060 bytes
SHA-256: 4c0a3f0893f5e69c6acf0c6b7f036872587aec6188c41bdd40a009ab43c82216

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