Malicious PDF — malware analysis report

Static analysis result for SHA-256 af32eccdf03692be…

MALICIOUS

PDF

98.5 KB Created: 2021-09-06 15:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f106e84089a80bc370dc2dca36a68e70 SHA-1: 65d0b35c6f58c611b0e47959c4ca1b706a35c0e2 SHA-256: af32eccdf03692bef76caca22bb151294023a2b67b33db1fb9e96318a2d63b7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=sesotho+literature+books+pdf PDF link annotation
    • http://lungshingcentre.com/userfiles/fugerifuzawiwutazenolot.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160756cc653001---68059902231.pdfIn PDF document text
    • http://jucal.es/images/file/jarerajipudifabelux.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/92596b6d57d6a80fb2187fa9623d3c0d/99351647375.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ce997a74ee8ae3bd69ca26c3985eecb8/37958500787.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/2839625871.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a820ee1d366---savorejanajibokumopefolup.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/768894626.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/medotewabo.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/83798355663.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/20951330565.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/55482874624.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608019b5648b6---muzevelefowaba.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/96495735084.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/15716534094.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/12488936141.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/h9e75c7tounf7sjsb667lg3t1o/bezigawunozam.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaf66da3ca---62758086076.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111bf48a1631---nusozibirejojarax.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/5fb2fa776ee32d1886ac9f4d7a35b503/29367837905.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/f7529ba195f32f83e6b35fdd5515132d/vokowizuze.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/wurexiwadilix.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_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 10900 bytes
SHA-256: 9d453b6f148e61ad0bf8b26aeed97892b4ca15523f8ef221026e4cf2dacd6208
font_01_sfnt_off00012859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 23288 bytes
SHA-256: 031091482f88e9067af6906555a71f8bf05cff43670f2a463f4f04a60940e023
font_02_sfnt_off00016415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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