Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc67b3b1649677a…

MALICIOUS

PDF

76.0 KB Created: 2021-08-30 13:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1e6f0d6636cde364ad4c6a0e64c1bb3a SHA-1: d9c106ca9429d23363886abff28c38083dc9e79c SHA-256: 7cc67b3b1649677a93193bfc4230c9cddd1a994d290be51327f554f8d8a90240
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/323b65a5dc7e76ae8d42712946b287b2/23175679287.pdf In PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a6848088---gojalufovav.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210603233459.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/88630949628.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/649d2c5431ac4e94828c639535f2f8d2/wuzewazujufem.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bd831b5d8---zagotunezolir.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/jisuxunupevu.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/5bbbb5def18a014a939040e4273e7621/69467288738.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/rulilomatifafewuzep.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0c9f7962b3317c56039cae7e45d0c16a/viropofuwavurapanos.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/20344707984.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/6b183b51c8654a2ea6669f82ad1aceea/91628689375.pdfIn PDF document text
    • http://mayjack.com/upload/files/53257235585.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/82549927829.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/sanakipopewigivozu.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/365029957.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/5d2b19dc0c5d2aa22de29608848bb853/7440615486.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c494ccbed9c---15354383649.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/lufasiw.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f4b39c715---99030435967.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/041a0c78a92ef425aeadbd6cbed308c5/jizobifafivuwa.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/2omi8vvpe06a9l94g1g8ns40b7/84820339453.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/subuzeva.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/poxom.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160856fda132de---29647880530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=qibla+direction+in+current+locationPDF 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_off0000c529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC529 17448 bytes
SHA-256: 98aed746af3ff89b4cf4731f85adeb5b51812479f943ec2b695a2482a4e14e4a
font_01_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 10492 bytes
SHA-256: 15a905f32adbce1b3b407397506cbb67476c0cf676044ee07cbd18dfaddba6e7