Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e40b9dacb0f3557…

MALICIOUS

PDF

73.9 KB Created: 2021-07-25 18:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88bb61cc4c31e1cab406b0d02023a1f1 SHA-1: 2ecf88f3485ad65ad20a085bb96ec1079ab72d36 SHA-256: 9e40b9dacb0f355733d8ac1418df7b2d49ea7b59d8867118fe7f4d9c3f441d77
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown and potentially malicious URLs suggests an intent to distribute further malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://skatrip.com/basefile/skatripcom/files/pupana.pdf In PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b47104e29---70180968651.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/67118033137.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77d0392b63---97964752833.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d2116dcf9---tazuwukerovudexoratapi.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/nenudevurad.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/15839636967.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/lilokarebejufixuvusi.pdfIn PDF document text
    • https://agermag.ro/mm/file/82088654045.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/8914156696.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/lsdejqka76af84ke5g1qo4q5e1/95918526987.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099d1efcc09d---74102719193.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0499c5c65f---zowufidavumabavaxegikezo.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/83238061144.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/basukenukirug.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/41206484922.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a252d6c2a---1977150598.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7fab4f88---xakizulerira.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/pexatanevame.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/44379049066.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/20064720622.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e4f1e8880c46abe507335dd609c22151/304128558.pdfIn PDF document text
    • http://balone.net/_upload/file///sirise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=volar+sobre+el+pantano+pdf+google+drivePDF 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_off0000bcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD3 10848 bytes
SHA-256: 823ba1b7aebd66e5d45f39ebe63eb3e3db0254df950a0f072d219d4ae96a4a01
font_01_sfnt_off0000d593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD593 17512 bytes
SHA-256: 3048b386c9750ed487b277cd04353acee967869abd9e35d47cdaa007bbe8a269
font_02_sfnt_off00010193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1