Malicious PDF — malware analysis report

Static analysis result for SHA-256 8005f835cfcbe3d0…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 18:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 78d8b21b5c0262ceb36305c054f1e6ec SHA-1: 9b2a7064f6bb8ca9b4de2471c87ac7df7a03d181 SHA-256: 8005f835cfcbe3d051ef596a5dc085d2e3813ca3df821dd37a9835277456e184
176 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking embedded links, which point to various compromised CMS upload locations and disposable hosting. The primary attack vector is likely spearphishing attachment, leading to exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ntep2008.com/UserFiles/File/38141820518.pdf In PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/34062832117.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/fepesewosilo.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/rikonotol.pdfIn PDF document text
    • https://grnca.org/img/files/files/tebagu.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/25071428304.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/7496764104.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/14e17101ec91a8e55158103072514330/dunipafagaf.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/0c56ae28fe30da31f33c18c532981897/13320547324.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/75241702977.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/fakeginowome.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/juzufelososilagumejusa.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/zajekofulon.pdfIn PDF document text
    • http://nhadeptannguyen.com/uploads/files/xewaxupujuvawirovagofoju.pdfIn PDF document text
    • https://mollis.rs/files/60245237495.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161486f2398b4c---42322873684.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/03rc5d9vu8dgftkb7l020dea47/91488331547.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_25_09_27_02_8256.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/madakelu.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/linikokivuter.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/71210494297.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109220818458230.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/11105531511.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9a039b11b35c9d3def0428f652877d8d/86160047192.pdfIn PDF document text
    • https://softnettechno.com/sribati/editor/uploadfiles/wuruwirowefozepef.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/sjmjehnflsqhef1a0vlpac38fe/zenazubawa.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/77983736533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=loveyatri+full+moviePDF 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_off0000b2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D5 14000 bytes
SHA-256: bd412e5472a4b4242150ba685e3ecf7e3cba8aa8f77a4d3c50413aadff1e6277
font_01_sfnt_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 10340 bytes
SHA-256: 1b2d9d4c55057f976d60799e7498b27f50013dbb9a9e600839a9c040da6b8ef2
font_02_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1