Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc0c80625786348…

MALICIOUS

PDF

75.4 KB Created: 2021-09-24 22:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a111896e14bb6f2fb506ecf7b1444ec0 SHA-1: 727d68d1c8d4834194449ace5a1485417e399e8d SHA-256: bdc0c80625786348edc862896e66d3cd87aa1328ec2cf8d440dc9827b6b1414e
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 websites that appear to be part of a link farm, with some hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users to external, potentially harmful, sites.

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 https://bucatariizidite.ro/printuri-fi/files/91162233536.pdf In PDF document text
    • https://sharmtocairo.com/userfiles/files/11790304813.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/pituxejekopodapopugadif.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/punewesogugimoj.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375b696508b---xutosekotanapapulemojipa.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/nijom.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/danogak.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/28837299571.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/pejaxamefakuvaxofibetajad.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/22360867160.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/jazonexezaxozowivoxopuba.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/86824850932.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/84353682508.pdfIn PDF document text
    • https://magerp.org/upload/files/50847812252.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/pokejajoxufezi.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/28859997123.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2fff30c65---54762071881.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/busisosumesavofu.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/vi4395hbpcesi5f634ci5h4tuf/zuviliju.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/58379481444.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/79063654170.pdfIn PDF document text
    • http://okvin.org/userfiles/file/75719364889.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/31396450060.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/3045150520.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/42474968149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=monster+hunter+pelicula+completa+en+espanolPDF 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_off0000bf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF36 18604 bytes
SHA-256: 7ce480466612e71fe8c6bc6436d981129e6e239ce2f3c5f907566c66b7ab8d10
font_01_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 10732 bytes
SHA-256: 5223db7272896d8c6021e334348a391b6fb4c806c9fab431bc69c5942c144a08
font_02_sfnt_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1