Malicious PDF — malware analysis report

Static analysis result for SHA-256 6132d6c3610a6139…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 15:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1f66c4a5053417772aa4fab021315cd SHA-1: 483be898500e9c40e707c4b12fa5946414f150f3 SHA-256: 6132d6c3610a6139b9831f613fce5eb32054e3826f54c004471358ad0916e659
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, several of which are hosted on compromised WordPress upload directories. This suggests an attempt to lure users to malicious or compromised sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://loaamtran.vn/files/usersfiles/files/fudegitopepelufolapuf.pdf In PDF document text
    • http://eksan-ltd.com/userfiles/file/bugibitexesuvebakan.pdfIn PDF document text
    • http://platcometals.com/images/file/medixatasisavowakodos.pdfIn PDF document text
    • http://arslanemlak.come/file/pipexavivevimu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/r6cg6o1jlekg0bor0bb9ipaqpd/mifan.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/30338166983.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/zonudujawune.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/80090183659.pdfIn PDF document text
    • http://guowangcable.com/d/files/xiwapupotekosate.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/86535833187.pdfIn PDF document text
    • https://patc.fr/imagesfile/feginegepuletuda.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/wofegaxefan.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be4b0b831dd---betofojejow.pdfIn PDF document text
    • http://tcihk.com/userfiles/93808900712.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760418b6882---zafuki.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/vuxotelilubob.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/towodabulerejarufegaxu.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/nabam.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/541f9711c4fa796dba574fab9bad81fe/bukurekidisidamadegetezaw.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/wunemuniwigedisiw.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/4h4k6s5ma5k4960i6fuku9b42j/xivoxakodilofulozugi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e8eb7d7c---16558592067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=czardas+pdf+violinPDF 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_off0000ca64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA64 10416 bytes
SHA-256: 3ab43748cd161a5376fe6235c44b0b57e2b28e9e99a71587595fa953433972e2
font_01_sfnt_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 18888 bytes
SHA-256: a4abbdaecd77cdf47532aa5bd87776d6d5f41c4085fab155a94861f5df49d2f1

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