Malicious PDF — malware analysis report

Static analysis result for SHA-256 e063d71d1f9ef4b3…

MALICIOUS

PDF

68.4 KB Created: 2021-10-03 08:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 29b6135aa21ef8fd6d546d326671b198 SHA-1: 5a79fee2491a28e2ab99856e2558175c80a8c320 SHA-256: e063d71d1f9ef4b368a97cc5281eff6a78b295f540c45d7c4f3151b5da2d05f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://lexus-custom.com/js/upload/files/ripawomewap.pdf In PDF document text
    • https://actsonics.com/uploads/files/202109141109403349.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/posoruriludojulirasag.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/94267792990.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/44629860859.pdfIn PDF document text
    • https://norservis.info/files/files/sedutesubekadowaxapirazut.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/jurebadidefagutewugabimo.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/jasebadazukepubagapu.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/velefok.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/5857593079.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/molokasorijozebusipi.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/57468757497.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/kezevosatedulinilebavaxat.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ssm1tug56kr6g5o3h1jqcu3p35/muzuxaga.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/wavorexazid.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/56876223685.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/gutorotawiviloduzexuwisad.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161558aa20c1e4---16812017671.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/53605672443.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/16251263397.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/82016134768.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/1ff99d16f6a9598b946af9204a8ce26f/62488105359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=international+secondary+science+3+workbook+answers+pdfPDF 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_off0000ad3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3D 14588 bytes
SHA-256: 37699a1ae7265e9b4e9620292e05831ad36e32206d6dc791d97989170bd91774
font_01_sfnt_off0000d1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D2 11168 bytes
SHA-256: 63151cf09812b9a864bb5f385041b58b253d388d4f65335392fdf4a6ea2369a7
font_02_sfnt_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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