Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc68f5ed60f1721…

MALICIOUS

PDF

71.9 KB Created: 2021-10-01 14:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d01efd467198739d5e4df68fbd2b15c7 SHA-1: 1833f52a1847550522e42218a983efa8653e7739 SHA-256: 0cc68f5ed60f1721f87aa2e78a612c1c931c8cd9b17baf3892272a16d4a68b5e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress uploads and disposable domains. These links are likely intended to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/kio7ljq5rl3iu9h24sf2h9f4sm/55845759520.pdf In PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/demidaj.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/1vakj9q2q3ekm8qti3p099imcb/luvixopuledido.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/50322393771.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/sevigesakalevunumaxarasor.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/90059288534.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3c0490201---sufibanolirav.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/82478883103.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/wibiwu.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/61951080361.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/bozenegikoxitonomakebo.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161563ed9cdeaa---237387690.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/4196384634.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xoxerej.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/tifoke.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16148042ae1645---7810395117.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/jekanivakijawikekinuwux.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151c6d4d7589---wobow.pdfIn PDF document text
    • https://granitnet.hu/editor_up/9357242780.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/55285601742.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/42866511683.pdfIn PDF document text
    • http://capableapp.com/uploads/files/21445646162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=this+could+be+a+temporary+problem+or+your+android+device+may+not+be+provisioned+for+data+servicesPDF 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_off0000b11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC933 11268 bytes
SHA-256: 655ed517fae50a07ea545c0606bd48d6afa0f64fe0004377fd6384376aac4574
font_02_sfnt_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 17840 bytes
SHA-256: 6ac771a9798418edab56daa254a19f5d8de159e5768ed396b81477d19d1dd615