Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2f348ebf094ac6…

MALICIOUS

PDF

75.4 KB Created: 2021-09-08 07:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e7bbe21607ec5f2dced67166b0fa0aa SHA-1: b354064ef708b96d64fd4d4db47972b8c52ae4fd SHA-256: 6f2f348ebf094ac605196c6b1a38abee09fe78f0d67538de72f0d428dbf2eb9a
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 or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nkland.org/userfiles/files/tinoroki.pdf In PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/walog.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/98857510271.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210702195126.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/47065294225.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/82564606757.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/137301925.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/lilatuzonenuniwarozega.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/2113981852.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/wivijefixusisap.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161337b21c1b87---lunixowataxusugo.pdfIn PDF document text
    • http://healthywithhart.com/res/file/mijatumuluzegiv.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202108281425076212.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/jotizusujeguvasopuma.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/jipex.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/fajusixafe.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/14586695775.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/gapepadolamikuwobupufo.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/70801012343.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/bobikozemibulotumeguwu.pdfIn PDF document text
    • http://tercovci.cz/files/file/90517035905.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/0eoqmabpv2bcqsmltp70406kcl/72180643157.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/84d5f077dbf38507e21698c252ba464d/ridikoxetivaj.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b0491061c7f---nejuloxabezulawak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=f%23+tutorial+pdfPDF 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_off0000c5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 18136 bytes
SHA-256: 525aad9230c7dfd2532865b9bb77c349f9449ad495267c56115b8ff571115428
font_01_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 9052 bytes
SHA-256: c2b8dbe43b4eb35175bac665517eb0c79c39d17d91092d9b7f24dc3a7abf91c1
font_02_sfnt_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1