Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcce7f1299cf52f3…

MALICIOUS

PDF

81.9 KB Created: 2021-07-05 17:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 22b7b1c64ba5060f7f16b799f97d2031 SHA-1: d5f52acc9b1b8e4d7b6a8feca8044c80e107669b SHA-256: fcce7f1299cf52f30106bad584f7e149819a77565d8712fcf14a0900688cf50e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://dienlanhhonganh.com/images/pic/file/fozekevi.pdf In PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/firuveroxisot.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/jr11q12eavcetu1jod9hdoqhge/4962458003.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/o009bnbvijk9oq3quf5liqpfl4/33326021039.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jotup.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/47644965029.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/27960971316.pdfIn PDF document text
    • http://mertlakustika.cz/images/pages/file/36747388114.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/50863340672.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074485d6a3cd---zipusuzamagudirevame.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/bikus.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/sawexudububexegelu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/36c1c21f2869084dc187764a08c9cdb2/91253173698.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/bonipifivapawinuzex.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc44d6db6---66555711485.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9965c2a86---pevaxagupomufipatut.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/vifug.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/2805269268.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/rixeloxolubexusebuwupas.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/28530005442.pdfIn PDF document text
    • http://aps-mes.com/files/file/nerijaxus.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/46966394353.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e4b392c3591d8405f85ac60830a30e4e/98207446477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=chemistry+class+10+balancing+equations+questionsPDF 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_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 15596 bytes
SHA-256: 60a881373a6b2f69067d192626b6786265960aed2250942061387b6b4b504549
font_01_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9B 11384 bytes
SHA-256: def7dcaaa0a8c8a32c0920b61ebaa0225e930ea3c0d36d2fa2d19cd8f95b5d1d