Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1c1e4599c85961…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 15:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ab05f731da0d11a773b5f061dfb500e SHA-1: 0493f35b2794abc4ef1e7fea19187cfa2041752b SHA-256: dc1c1e4599c85961cf46a586cbfdf96b847297466053d1b77a6eedffd0275651
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links indicate an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/15559243218.pdf In PDF document text
    • http://shuswapladystriders.ca/userfiles/file/pitizasol.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/voniwuran.pdfIn PDF document text
    • http://hhtaitung.com/CKEdit/upload/files/4247024691.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf1c18c3f---janugezavuxodito.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/sizopepunubonijevibid.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/f45hd8j7lu8il5odi6gp5mc7j5/29922227283.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/50888264955.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161146eaac1281---74983538748.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/pukakutiravotoza.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/kasevilumet.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/vejuguvuputizovegebinewe.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/gegewenigon.pdfIn PDF document text
    • http://asustainable.com/global/file/fewamiwetoriwabesaj.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7124280eb2f6f878be5f6c21cb29a04c/90324287594.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4aedc2fb2---47785652036.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/1o6k5ettvmi6mkqelagqfdhq36/40113342811.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2407e4cfa---3888699905.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/db55e92407944730d2ef47bd47932391/zesanapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=python+scraper+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_off0000b9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B4 15872 bytes
SHA-256: 9e772017f703d96485be69b2fe2a9113f46db6e0be3362b7888c649964e30117
font_01_sfnt_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1E 10696 bytes
SHA-256: 4de25e542fac492cb6031ba668358a3836b41cf5b26121535fb5157ded649233