Malicious PDF — malware analysis report

Static analysis result for SHA-256 5961e67180f7eecc…

MALICIOUS

PDF

135.0 KB Created: 2021-07-21 08:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a3cb0a66a1af15a8b61bf66746d0d23 SHA-1: 9b6505834d0a3f323555d69f405f051346a17540 SHA-256: 5961e67180f7eecc440634054191045ecc603429b292ffb5e639d03bd17e6587
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/bbjf8bhb4p3taa2esejmnusre3/36303725171.pdf
    • http://asesorgubernamental.com/images/file/21454782940.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160704518c10b8---48294763963.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ee08b4e24f8f479ac83a02ae9b8f6e80/72546320704.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c05eb41e5c9---72168004283.pdf
    • http://makinsushi.com/uploads/files/86704861841.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/9eb6uih8je5f88ggbrs1kd2801/zenikafefoduxeriwirar.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/qdq4i1ks4js4uuhmi1encdv371/56707116139.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a8b18356e---newuberusolafowimik.pdf
    • http://www.niziointerior.pl/upload/file/puvudebofariligumetogume.pdf
    • https://sasalidayanisma.org/uploads/file/24803630082.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a549d47330f---60627570140.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/bc4421d10f4863c12a68c82797d27957/70812384584.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607346153517b---xuron.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa1d6e32c---wuzuxoka.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/3g7umt3a45iqjrsm85lva446t2/sivaverudadu.pdf
    • http://afgventuregroup.com/cfiles/file/woxamorazetijofasuwisi.pdf
    • http://voorwindenotariaat.nl/app/webroot/files/ckeditor_files/files/4995966197.pdf
    • http://tasarimak.net/ckfinder/userfiles/files/miwarikuziv.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/tldag3vhfeaeukacdfgbp0jigh/83423524836.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/fuwodasizixor.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce32983cd0---41046910415.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/lq9igdor9vr2hl9c3dc66t1mpi/91550432153.pdf
    • https://sonarmusic.hu/up_image/file/futalalovafenodaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pituitary+gland+effects
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b0e4.bin
b0ca9f87de9de0d5449a52941cc87d7a9c725e07f0cbf6ba2700f8281b64ed59
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0E4 10744 bytes
font_01_sfnt_off0001c987.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C987 16792 bytes
font_02_sfnt_off0001e199.bin
ecc58af92fbdcc422ae417b9476ae9bb73c764a7d7afcf1f01b2aefc517bbc01
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E199 17172 bytes