Malicious PDF — malware analysis report

Static analysis result for SHA-256 169e1e7b64c6cfbc…

MALICIOUS

PDF

97.6 KB Created: 2021-09-13 15:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c93e2de33e81abbef30dd69d8b157b78 SHA-1: 2a2629e8be9e9f6fc3839e20628d1abb63225c76 SHA-256: 169e1e7b64c6cfbc763ca48d84ffde6afecfdc3a7c409b21053ac7fd8902f02f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these compromised hosts. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d8da73506---labudewi.pdf In PDF document text
    • http://langeline.com/ckeditor/upload/files/dumogozitu.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/pizemexe.pdfIn PDF document text
    • http://benetalent.com/upload/files/65368475061.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3528f107e0d0a043f0a6d3e5a4570701/23858683024.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/zulilosunonebeze.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/vuwivewadujopes.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/45860507902.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/63646968744.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/vufixoruxukawoxuzogisu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613415471fc31---73993087705.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/77306225943.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109061801499991.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/zepifasamekogukutemewo.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/15593386222.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/93399661222.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/zapiziviv.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/32612556591.pdfIn PDF document text
    • http://showpelec.com/data/file/20210908_211457_176.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/nivadotijumarux.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/pumojeka.pdfIn PDF document text
    • http://tzsunup.com/upload/26969712635.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/penixozesixogok.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130278740fa7---42363396614.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/vidusasabuwagusobebipi.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/38593085631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=season+3+fortnite+battle+pass+skinsPDF 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_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 17916 bytes
SHA-256: 6976ed50d85f8b7dd4053465f0dc28254b0548150521a6254f27fe8677bd319b
font_01_sfnt_off0001476b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F82 10828 bytes
SHA-256: b5e3ca9f23e2500f463d484b77f51783d7bed1d97f34480aa7ed3fff49d34b1e

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