Malicious PDF — malware analysis report

Static analysis result for SHA-256 f843bc274f1ca1b0…

MALICIOUS

PDF

72.2 KB Created: 2021-09-15 00:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b13d4089bf63ef092400cfe843f5806f SHA-1: 7aec5ca02c89fe3fc7d4c5f96e0b0d4a6f202c5d SHA-256: f843bc274f1ca1b09aeeca38611f269240f43bcc0c894a59086adf18e89d12d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://angerdress.store/ckfinder/userfiles/files/desim.pdf In PDF document text
    • https://il-gusto.com/images/file/69577920674.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/joveguziraniv.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/77310406172.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/penujoz.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/53403796723.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/xusubabunikob.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/29648285827.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139596437efb---3187813005.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/zosopanugulofozib.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210907_012451.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/96648976362.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/36975157195.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/66286818077.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/bapazifisuxezojo.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/junutozexeganimex.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/6938182798.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410db40d397---67276998333.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16133bfae0f32b---95802960846.pdfIn PDF document text
    • https://angkalaris.com/contents/files/bakunakifufag.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/6022861212.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/nalub.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/41847694246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fortnite+tart+tycoon+skinPDF 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_off0000b901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD113 16604 bytes
SHA-256: d99dd2921ef104174b027dbba7724d5eb5e65ef7ba15a1fdcf40af2cd93bc66d
font_02_sfnt_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 10360 bytes
SHA-256: b2df013f810f00e3f81d843824764be748989f00d1990555499ef94013c0f1c3

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