Malicious PDF — malware analysis report

Static analysis result for SHA-256 1667d8ecf0f69e11…

MALICIOUS

PDF

81.6 KB Created: 2021-08-27 17:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0cfc069c45af15d6304a746430b75dc2 SHA-1: 4d7352f95b32fe970ccace0abcaf88421ae6e58a SHA-256: 1667d8ecf0f69e11104aca1a824677e0c3d283a633587fcbbb60711b43831242
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://diplomat2014.ru/ckfinder/userfiles/files/zosevutatovowezozofu.pdf In PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/39478194758.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/6c0a44ce901ff65efd0dd4cfab19bcb6/81141937525.pdfIn PDF document text
    • http://bamila.vn/luutru/files/86019049742.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e858950d3c---51653135489.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/katine.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/46e5b9f5ffb411332799d453a023e5fd/24271122687.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/didosupitato.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24871f611---vusopopabulajegu.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/61269724309.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/livowisirakilura.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160819d5780317---peseked.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/55741054573.pdfIn PDF document text
    • https://breedlife.com/upload/files/kaboluwoxes.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/30487565701.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f57254c4faf---85527545964.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/58591115691.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/98926045261.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/a57f00c4268fa42f92e99a861b9aca69/zefulukemixudax.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/dc98905b4fb5352ed6b043f49afcb673/mexexe.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/58234543272.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/adfa2b4973c659f4c33283a5dd07040b/tasitimenenoxulux.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b31072c3c1042e61f94e54ec353e764a/80601924680.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/49661809424.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/3f2f7ef2ac830ffdd39eebed8381988f/gogusi.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/73593351772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cry+the+beloved+country+character+analysisPDF 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_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 15948 bytes
SHA-256: d2dc0686903f7aa619d2febae76003bdc1e9eb69ddc3fcbe3b99fd52608d488d
font_01_sfnt_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 10916 bytes
SHA-256: 0468619f72be7c3cb6ccd085365a169c5375a42340a34b961810f8a92a40a70d
font_02_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1