Malicious PDF — malware analysis report

Static analysis result for SHA-256 5842ed0be80a81ed…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 15:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c7812f17d018c8629ce09e629db2a9c SHA-1: 14b8112c5b049027a244d947c700cf9f7e87279c SHA-256: 5842ed0be80a81edc2ff6016cfa197334f9bf2ceab3c10032a7de0c298380292
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm pointing to numerous disposable domains and compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://j26clean.com/upload/files/gadanudax.pdf In PDF document text
    • http://drivescuolaguida.it/userfiles/files/91685402331.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/17120536761.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d814adc0d9---15929630215.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/70851856731.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/savutixonakiret.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109152314098122.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/farakimeme.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/29283238746.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f0c0041b956b0fdf903d960bfbf68a3/51738909101.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/vowafufuruv.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109041428083511.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/43095346363.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/90663917903.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/31580809292.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8945742bf---24121183840.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/tamuzelolozu.pdfIn PDF document text
    • http://willbramephotography.com/98114902525.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/84003535964.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/39519720019.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/3186361842.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161407f387690a---89303286709.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/fezenabilosowewevavirogul.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/64092537324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=kodi+19+addons+workingPDF 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_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 17976 bytes
SHA-256: 22be672d6be9b5b1be0914c909ebf6c9145821b7d2fc0d8280a62c5730f4ddcd
font_02_sfnt_off000134bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BC 10536 bytes
SHA-256: 6ac13ae0c4daf831d976d78b9575a51ab6ccd44915e1c992d987b8b7949a0c8e