Malicious PDF — malware analysis report

Static analysis result for SHA-256 5520b62de867aeeb…

MALICIOUS

PDF

77.1 KB Created: 2021-09-01 05:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 8df70fe496cf724317b809ac7c400a64 SHA-1: 0010c885cf29e0e39aa75d4dc93e9deb85febed7 SHA-256: 5520b62de867aeeb8a41b6b4464e2c5466fa0684d6baf9f7c2725898ea990602
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://philabc.ru/uplcv?utm_term=possessive+and+demonstrative+pronouns+worksheets PDF link annotation
    • https://stallion-international.com/userfiles/file/galagakedawalirosawudedo.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/64659835424.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/jemavosikagoje.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/41f37ff4283c6e89547c5c42f0b81054/dijazitena.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///ruwiwovu.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/gusudokudanupilokekelu.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078af06a56b6---22780390082.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/nesizazokopanapaxaxe.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/naximomazagomodaredapul.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/kizogixasidu.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/99001028856.pdfIn PDF document text
    • http://faradbox.pl/files/file/wofoxewepowuximibela.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073362659ea1---gitulumitexukejemur.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/5246237183.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/wunapalevowig.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/tijasunafolutet.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/759c1f682542f0b419211492c70b26f6/zozavipujedeguzasa.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/rcgjhi9kfh9icsnvd3l8tkc6nt/74638567574.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/dajiwewalidepigelola.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/pirosofifage.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/sodizekujutamugelejijude.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/nojobupojoraponewadojuv.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_off0000c634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC634 18260 bytes
SHA-256: 9a256f678aa171d298d83625da1ee85077e677aa81374582010fe7656a83c387
font_01_sfnt_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 10956 bytes
SHA-256: 3cfc895905e3f556820b8ea5635d0d6ce97b274ef6beb05d9e0663fe87251ba4
font_02_sfnt_off00010e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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