Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4eaa673fae9685d…

MALICIOUS

PDF

86.3 KB Created: 2021-07-07 01:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23cb0ece5eaebac9fa973d9d4f39e774 SHA-1: 8d2589e14bdbaf6c2057baae0ff6801df5060d06 SHA-256: c4eaa673fae9685d313c5a884cd2621c3c0e9f8c4fe558ef4ee4de3484521115
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection by security tools strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://irlanc.ru/uplcv?utm_term=never+seen+a+man+cry PDF link annotation
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0fcebfda1756a6686a337cfed43952e7/zonelominomosinedar.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c00a37b00bd---tafafejuxebimomanakelula.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3621b3a57---nesegisonogu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a675cd04c2e---87230108948.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9cea181ec---siwopekivuwawujo.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/34bd7c32493f9ae8bcae2a67fbfdbf8c/40013495443.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9dfabcf30---texotafugejer.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/60169443917.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/bdc34eddf7aa9d175e9a5f41000aaf36/mivevewejatemisekadimad.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/20fdde9300cde8f0d3c39c00f4c77d05/34751909324.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/60853771206.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4550a614b---kikuni.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9a93fd29---derevixazejigova.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/14324906036.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/67689364486.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608793d0ada87---tarixipezeluwiwijirad.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d3daf0c7d---dibeduxatetutudire.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/22744699957.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/piropeluvete.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/16972106447.pdfIn PDF document text
    • http://fitviewer.de/files/file/zigabovadoxebafezebun.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817fa2341f2---jonawiwudulikuser.pdfIn PDF document text
    • 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_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 17356 bytes
SHA-256: 6d84e2e0800e31da9653737fcd944a385b562b5afb3014640d826a15900f40c3
font_01_sfnt_off00011d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13578 10192 bytes
SHA-256: 01cd97dd8b6701ffbd454625e34c368645bdc099a36a4fbe29cf223529be179a

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