Malicious PDF — malware analysis report

Static analysis result for SHA-256 40854e172cc8dd8d…

MALICIOUS

PDF

89.3 KB Created: 2021-06-25 17:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 35339c955d282e0100ead78eda30552d SHA-1: 865fdaf3a77a005f808292085948388c63675381 SHA-256: 40854e172cc8dd8d6aac0950449c5bb41951b761a2341aba5b242d087f458621
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload locations and other potentially malicious sites. The PDF structure and embedded links suggest it's used to distribute further malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bulgariapools.com/contents//files/maluzimefejogifelawegod.pdf In PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ab274f14c190b47946f1a5e5d99ecebe/pujivonofuja.pdfIn PDF document text
    • https://energooptima.hu/upload/File/55880790178.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/kubipuletapanadozebifa.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/savegirarudukota.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/32931915498.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/noserakazibalenoxibasi.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7325e8d8---regofod.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/3106dqb1rcvb91vn8pr1ufjn5i/puwowaduwus.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd044daa68---96999085181.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb4b93288a---jurupanejo.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/69267037597.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca043a98082---bamadofanajujuvesogi.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/28472606494.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/8a7818f5d4966e389d0a815db4bfc154/donemukofiromejobiv.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/n6d4a0qq3vhs2ksr9dudojjq5h/61340339388.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9498577fe---bufuzobuvirawixuwefij.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/3mvsiubn6nfckj3bef3f6eac52/diratujumon.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/1426432509.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/va4rf1j56llgsk76kqcfqgvsae/lonadetavebexafagobud.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec04ca7c9---18725910215.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7a1ddbd60---kugiwujosojonemomaku.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fb1omkk6mhnuhvcj6vejok1fl0/levixokewival.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/susomusafu.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/94901350485.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/8ea3i1fv5eagmav773hevjcsh1/pibogojupabixev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=live+premiership+football+todayPDF 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_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 10936 bytes
SHA-256: 4cc6134203ba7e5bce264870e9feaf7277b0fa6a2f1c10339e5aeb8eeefb2998
font_01_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 17176 bytes
SHA-256: 308e584950896449d6511ae28dcd8deaa98eaf555cef0b303bea3c295c103b87
font_02_sfnt_off00013e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1