Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d50a64c17c7d3a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 16:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9483e5de44b2c8cae56520e7da6f3c16 SHA-1: 08a1b0c4098cdc1f0b3f8b888645d2ef4d608eed SHA-256: 12d50a64c17c7d3aab08666e0f2de10370b2da3350c195f22c714bedfeed80e3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The presence of these link farms suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jxloanchien.com/style/postimage/file/65085396796.pdf In PDF document text
    • https://theatresaucinema.fr/uploads/file/7145252990.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/wixozawewunedazaxe.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/64524579424.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ciuveukbe0khif7fmoo7cfjm11/lumiro.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609835d794462---xipexexuwes.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/66531777050.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/icu8rk6csa9mic9ir674lidqu8/lalumixogilotekenulo.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/g85dj9j3k27ob87k9fcfu9rmp3/6751631205.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/laponawusidar.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/79409661984.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/8cc6aa0b776e54bcd863ba88c1625ced/37854172363.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613538b806118---wijumezifalefun.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c792fa397b7e48c1267dcb2490909b15/zisonagawasafodiw.pdfIn PDF document text
    • http://getem.plfiles/file/67274028948.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/63324649553.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e668a7fb36---guxefakevidomejigoxodikex.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609d017429399---59807631826.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/be0e0d1797de0732d546bc4fd066f398/69823825873.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160894b70ad385---namusiporebiradonabi.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-22/20210822073744831675.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/febogufubakub.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/gilamejaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=who%27s+afraid+of+virginia+woolf+edward+albee+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_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 11000 bytes
SHA-256: e3acd9153cbd7a9d7e6a124148ca9af9a992c13dba5b808ae2e857190a7c5ab9
font_02_sfnt_off00011317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11317 17500 bytes
SHA-256: 10be23a24be1043925343c5864c43e0efa5a39265d84ef3e85eaa9ec5faa8d51

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