Malicious PDF — malware analysis report

Static analysis result for SHA-256 da414edcd45e0167…

MALICIOUS

PDF

86.5 KB Created: 2021-07-16 22:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fcd4b1d72723ce67f26a884f542a714c SHA-1: 9d13f9c19fa6bc744e2836109a21f01d0f5e9d90 SHA-256: da414edcd45e0167844d56adc9627b6cbd50984ff3237ae8be3a08d0470adde6
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised CMS upload directories, indicating an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable binary data, but the heuristics and URLs are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/midazovuz.pdf In PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160776254c9c8b---40961119045.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b070cb109f2---14621391697.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/i1o1bu4qhthq9ue8gm6nj4f7rt/tabapozigiwowarove.pdfIn PDF document text
    • http://poorclarescork.ie/images/41544047910.pdfIn PDF document text
    • https://lecapsuledigian.it/file/59113982115.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090832ec0c0c---43397365052.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae9264c3cc---22624962668.pdfIn PDF document text
    • http://carsonandchain-ip.com/userfiles/file/30434392105.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e6a39a26a---pejikarijomuxajufobazuzot.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bde1d9932---fopasawotawoxubivukuvefop.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5bbd70a7---51141716237.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d72fcd81e5b---welavibomaleg.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d81b53dae---72604921846.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/76693736313.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f4778352---diginebexa.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/159c4cdf01d2c8dd351bfe9dfcc3987b/lusetivimijuwutewetuloz.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160947ddacb38f---fewegalesuguvaxamokonax.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/wexisilugokupusunelo.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/92325413814.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/javuwagitigege.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/98c75d1130d4f6237801c2b2a4e6d5dc/baxinaki.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/28532188768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=taylor+swift+evermorePDF 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_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 10500 bytes
SHA-256: 07b623879f93e6b4efe4af415a08d4fd8afaadcc04f404bd0683be1dfc31c839
font_01_sfnt_off00010b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6E 16468 bytes
SHA-256: a3c7932335dc4fc45f1e6d55873402d4023115f800aaf7c3d33e91fbed393522
font_02_sfnt_off0001339a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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