Malicious PDF — malware analysis report

Static analysis result for SHA-256 21887f446fbc7948…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 10:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e180f43a50390ce6b38362bee7b99ca SHA-1: 5ca548769759d334e0c184eb82563f00abcf169b SHA-256: 21887f446fbc79485935ba0a7be54d3dc77081b5751d969e75224f5f67f09c7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://allytemp.ru/uplcv?utm_term=application+has+stopped+working+android PDF link annotation
    • http://md-servicios.com/userfiles/file/rasejabuzaxeta.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/70494237722.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/61896895478.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/88236879958.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/66507985440.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/39304661449.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/74951175189.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/68i5e4cp67r5vne0p47428p6m5/lazukavurejarodu.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413bbe23a42---42603673387.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/limibegajaveg.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109030145255041.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090911263573499.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/10633080961.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/33625283509.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/44483249690.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc53d6d4a---xejuzolekoxuberumineruna.pdfIn PDF document text
    • http://abnicum.ru/files/file/sowexofexuniwojag.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/35fvlau24q43ch44pdefhcvn82/melukuzomewewenuxitazodu.pdfIn PDF document text
    • http://consade.com/userfiles/file/mijiwig.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/jawifasuwifigi.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407f921198d---xibaliza.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/29317445085.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/89461202803.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614199da6a41f---77981202736.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/64596031155.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161333b1ba9dc0---20812993738.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_off0000d8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 19568 bytes
SHA-256: 2f4abcbf7691f5544612a90520df112a615811f4a1e6b1433a3af11d93a924ba
font_01_sfnt_off00010b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5C 10952 bytes
SHA-256: 258a1dff71f61bf250840b0f72409c06b59397081d3b1c67134021729419a23e
font_02_sfnt_off000124a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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