Malicious PDF — malware analysis report

Static analysis result for SHA-256 40320cd03866902b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 04:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc45d004b458bb1e67b423265be79339 SHA-1: 9afa2d28ec800e07fb2c45b308bd9ddc09d17b94 SHA-256: 40320cd03866902b8081dd90521d1aa7d6a442478205d3d6a8b67c646c203268
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous external URLs, many of which point to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be social engineering via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ropaalmayoreo.com/images/userfiles/file/wefezukowibefakajimozijax.pdf In PDF document text
    • https://hissekurban.com/resimler/files/vitabi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613267fcd98f7---mitifu.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/14340884702.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/93711049540.pdfIn PDF document text
    • https://kaparatt.com/images/File/waguwuzofabudeduzepen.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d6300418b---dugabepojabezifoj.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c436a0cd---bitidis.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/tifaxiritizunefifot.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/midatufugitokorovinav.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/favovuzutetirunimewunu.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/81735744712.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608607e088574---87505786798.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/dewarunedelosiz.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/90705219543.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/14n872712jf4lqcg18cd0lmc4o/javererabubazikigok.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210730005126.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/20528525961.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a607e61aaeb---teliminukidikopiv.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f18501dd29---49285242042.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084542cb9997---kofuvat.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/22292012531.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/5hui6ujlv52t3ani7tkptr197o/rekeranelej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=levels+of+communication+skills+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_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 17116 bytes
SHA-256: cbd15dd6dd7a4a1a1bfe635fd8a09afb2266cc3a190e0928f1231f0146d73790
font_01_sfnt_off00010511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 10896 bytes
SHA-256: 55c95e9f97f09f1abec9c79f65e4c704d956176e7e7b6ea0459c0809357e2fd4
font_02_sfnt_off00011e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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