Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ac590a71a2404f…

MALICIOUS

PDF

76.5 KB Created: 2021-09-05 20:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b87dd0e94a8e469716390c69b6a4f96 SHA-1: 348a9951a9712759e6c34b9511fbeb52726989e0 SHA-256: 22ac590a71a2404fce45bb0548a8d1fd1a8a82b3d477a3d15c645b9b1c3f2704
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The file's structure and URL patterns are consistent with a spearphishing attachment used to redirect victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/gitakemakeveleviborisuzus.pdf In PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/lirovekebumedupu.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d614a062c---todagajiminevazi.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/penuvijexizudewedosa.pdfIn PDF document text
    • https://tigaintan.com/contents//files/66665827285.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970b16bd11c---72996915698.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/19844557030.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4190d5f9e---dejadivusesujojoxelo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087217119d50---bofazetepusuragikel.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/225blvg0hi6lvs7injqv5v1p6s/98588245115.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/dutowikaretupi.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e04b85f0ed3---gumaguzujif.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/banarew.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/jorarosuxoradawilipenix.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/donufijenonetipuw.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/batizazewidipemumu.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/podojawuvilasevabexaj.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/53942718518.pdfIn PDF document text
    • https://mahae.hu/files/files/zurinukuzejikididofij.pdfIn PDF document text
    • http://allasclub.com/campannas/file/60795344428.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071736a8cc4f---31035708431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ps+kalsi+stereochemistry+pdf+downloadPDF 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_off0000c5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 11176 bytes
SHA-256: 140325281418447031b4b08a688bfe66e74d172b0e7f989a3d8b9dbca6407874
font_02_sfnt_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 17368 bytes
SHA-256: 8d9831f1b33dff32903b0ec96fee0c300732d12af8e734dcd5ddc4925fa7cd12

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