Malicious PDF — malware analysis report

Static analysis result for SHA-256 1957ac1ffe7dd253…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 07:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f530d52608190742d6c37f10eacc330c SHA-1: 8e6ddd6bd11ade216a87dda158f2fc75a1a52e18 SHA-256: 1957ac1ffe7dd253c8429c70ddf2d663859942ccfca521170037069e7400293c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation through link farming. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://sweatrinserepeat.com/ckfinder/userfiles/files/fakujaveravododubud.pdf In PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e35f1275be2502ea98f750fc23b562e/lesepubugikamulizijosejaj.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/gezopewosixofazaguj.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b65a46a8614---94912435848.pdfIn PDF document text
    • http://mertlakustika.cz/images/pages/file/pojazam.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/bd5004c6bc2e51fa7ae5d07186474b45/zaxabameruxe.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/sanenejexotejet.pdfIn PDF document text
    • http://keacg.com/upload/files/gisesarimusasa.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/91391348562.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/74528508743.pdfIn PDF document text
    • http://seedcambodia.org/htdocs/cljr/data/files/pigebimovekedifa.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/27967918453.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/74294732707.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/91078399116.pdfIn PDF document text
    • https://digireg.pl/upload/bagepazuzore.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210615175903_end43r.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/5718029838.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130c2ba9dc1a---suwakevovon.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b4c9d4359---vopurib.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/12120502896.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/37114927710.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/83183289218.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1aimcj3ksait6jlc3iopdpcbuh/guxas.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f23fbd60998caf6073f1272d14d03099/kikinunolesosexeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=lincolnshire+school+holidays+2018%2F19+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_off0000d0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C1 17568 bytes
SHA-256: 354257a8ace98457611b60cb75c58bf04072427780b989991e0ba32c03f6899d
font_01_sfnt_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 11392 bytes
SHA-256: a429a370f0c4c2c99b9e5a3d1adf96843f4aabbaa6ea4859a47ace6b3f0784a1
font_02_sfnt_off000118b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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