Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ade08f66755e48d…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 20:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8fc6fa0e1a7fb77c09045e3f0c8a155f SHA-1: cd3d93b26d1abcf6698ef961d866bf141f10f915 SHA-256: 4ade08f66755e48d24202027435a99ca52fc92d3d703e080cc580fd8ff95de1c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document's structure and URL patterns suggest it's intended to lure users into clicking malicious links, aligning with a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://balticstroy.com/uploads/files/barasurilaw.pdf In PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/viduliwofemu.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/kezizipetusaxasonad.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/buwototazomisinu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a890c26f1---foborizobogiziz.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/difajidigokip.pdfIn PDF document text
    • http://micruts.org/userfiles/file/vidumubefifadaxi.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/56529312164.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/79157867925.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140816306901---60847791037.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/49362720494.pdfIn PDF document text
    • http://pasted-radio.de/web/files/30089006396.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/92214338302.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/46465498594.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/2sl3dbicbfkhh9k9dpm657l1sv/nitufotelew.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/80578714358.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/10295867502.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/29328266170.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/76790986167.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/61661785977.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/62900064012.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/90330d10e566a47742e804376da77444/rekevim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=measure+map+lite+appPDF 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_off0000ae4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4B 10280 bytes
SHA-256: 088078a21b6913ca0a69f5266f8a7e22ca7fd53073bf7436d92c8864bfdd2022
font_01_sfnt_off0000c56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56B 16192 bytes
SHA-256: c320e3329e4aa981d1094469fc27c88abcd5e2cef8410ccc70cab5e9c92db9c3
font_02_sfnt_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1