Malicious PDF — malware analysis report

Static analysis result for SHA-256 88dce56dfa64e211…

MALICIOUS

PDF

73.8 KB Created: 2021-09-17 20:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8febed3831e2fc06cb958668fda4640e SHA-1: 50d7702fbf0bfeb5e3f9e8560d00656e4a3af510 SHA-256: 88dce56dfa64e211609a1dc0daf40b0b2d4a7887132f91c440f20c20b96f4ba2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161429c850fe07---41591537321.pdf In PDF document text
    • http://studioguagnoni.it/userfiles/files/nopuxiv.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/21297796475.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/tofofubasi.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/20940265564.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/bilowuzovup.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/5201ba0aa3c46636814e7451b4441cd1/61692783390.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ccaj8utslqrh5a4f6ofbea56lo/gegaj.pdfIn PDF document text
    • https://ags-car.com/upload/files/mukevovefojinelijomemuno.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/buzefonirifosineseza.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd8345bcb---gakafogizorukok.pdfIn PDF document text
    • https://emenu.hu/editor_up/48434348717.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/birazuporovipajunus.pdfIn PDF document text
    • https://kede.org/userfiles/file/36739804211.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/pomukapaj.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613046cdaafd8---gemifano.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/nusipak.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/99911273964.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/sakaj.pdfIn PDF document text
    • http://harlit.com/upfiles/file/vogezezifagiwukupe.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/zafitekezatugezemovaxis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=similar+to+garageband+for+androidPDF 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_off0000bcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFF 17216 bytes
SHA-256: 8626062c59b02768291c6a85b7214f1aad6027c35b864857987188fbed5d60a5
font_01_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 10744 bytes
SHA-256: 6a4ac032c2c39c42fc710ed039ef8b4a1d78f83b08ab4ecb8f7b877ca3798322
font_02_sfnt_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1