Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e4642357e09b95…

MALICIOUS

PDF

90.9 KB Created: 2021-07-30 01:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1a0222895f95df043d70a7136fffd475 SHA-1: 64035de6cf8df8e394ca6bf1ae08c51bcaf95b5d SHA-256: 20e4642357e09b957e78fc7f37fd814b377b7a239f5b8fa52de486e48c4b302d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm for SEO manipulation or to distribute further payloads. While no scripts were explicitly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/42129906764.pdf In PDF document text
    • http://gamax-motor.cz/data/dokumenty/vujukakofupoxumosiloga.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/pufarujigimuturiledumu.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/392be06d58d709f4503633c178c6122b/65679321621.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/mobotegajew.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/59d774c7513480f87fd49fa07bb6d501/24739119940.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073a27263848---farazulimidez.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/49806949848.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/m0amcnhuieav703u32g075kmji/76523302865.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/jekuputaburodajutisa.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/dewatitomefenotafasofid.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210529033852.pdfIn PDF document text
    • https://xistenze.com/files/files/77063052414.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/pemapot.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080584987f8b---verurozu.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/nidotuzigelidotasurijixo.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/2878c0f31d90a0be1ef1d2a34cd28f19/15283928771.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc44bd10dd1---lotavotobonud.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/2b5dc564fac9c6ccd3ae5ea1435707e0/85743339646.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16c1d8cb9---36200335025.pdfIn PDF document text
    • https://artenika.pl/fck/file/lujugisofip.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/nidawor.pdfIn PDF document text
    • http://www.heksan.com.pl/file/41314425609.pdfIn PDF document text
    • http://usagimatur.com/files/others/9677462200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=recipes+for+air+fryer+potato+wedgesPDF 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_off0000fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 17548 bytes
SHA-256: 649c69cd941ff09985c5e6102dbb2a0f982ac1e9803148f8c64490235e39ee62
font_02_sfnt_off00014387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14387 10888 bytes
SHA-256: bc225c6ae086cb375e31e51e856be611126eb57a40e451cda668bfe61dd11df7

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