Malicious PDF — malware analysis report

Static analysis result for SHA-256 a671380d12bcdff8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 01:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42e2301a901b1d5c9ff2e0a40ad5dd10 SHA-1: 7c7c827b36d7ad8b65f14e5f7441725ce0c272ed SHA-256: a671380d12bcdff87beb3da728d3e49b6fec155571e8f157cf44a64af26ae9bc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ms01bet.net/contents/files/11101082586.pdf In PDF document text
    • https://threadworx.com/thread/admin/uploads/file/69167754697.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/lapig.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/91147397643.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/jiwirekafefafepuxarefole.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/pixovezulijewukesumopopaw.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614098f3bb46e---73293179474.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/gezujalugiletepili.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/lovarozi.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5e4e99f56dc822b8ecb85a7d6f37fe6a/vufajevakomivibimeki.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/xepofidixanelix.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/31458570869.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/sepumixofibikaxuvogudaro.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0821e9355---misorumoranevazewinobax.pdfIn PDF document text
    • https://nhatthiengroup.com/files/uploaded/files/89168217655.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/nimupulopuneluruwasos.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/15048252256.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/sumijurivejaromez.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7b464471921be1d960eb1256e12d4369/sodowukodemubelalumofe.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375a0639375---11204093580.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/55af028dfd32a4907851b6b32940a78b/lasodaxuwonisegedenel.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16130bc4257125---jasalikozijuwizimadelazuv.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/gejimegevusobefunavolo.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/lazevawudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ps+touch+mod+apkPDF 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_off0000d332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD332 20888 bytes
SHA-256: 0de718a458c8b83b01709a4ea934f8d157ded5607ac31912e6b1c7d63c566fd6
font_01_sfnt_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 10500 bytes
SHA-256: 85ead05a84e4e5b7e0691834ed02ec6fbf3af48d910457d83d4294a97f48c586
font_02_sfnt_off00012170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1