Malicious PDF — malware analysis report

Static analysis result for SHA-256 1366b6943df8106a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 22:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7e8bc8eb7637af760ece8adc0b528c8 SHA-1: d560275a8df71c839351e5bc1a4e950a2285df4b SHA-256: 1366b6943df8106aeeb10df28da91fc7b6698ad6872356845ce266d00467b515
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

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://catamma.ru/uplcv?utm_term=nsw+whs+act+2011+pdf PDF link annotation
    • http://zhouzhuank.com/v15/Upload/file/202186259474290.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4f5531e1a---tuniviz.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/kuxuki.pdfIn PDF document text
    • http://mosjob.ru/images/file/memogagibix.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2dh97jigg76nohgh7b63khuno5/tibuneluxutaw.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/lixujuzesazamu.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16085d75159a93---54686331341.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/vezet.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/81813567981.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/dd2d41f4331d99869c86f33da87a5ef9/xutizusemaga.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/jarisaluka.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/14547985029.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/5a036d4964e19b437aa958dd3d5d05da/kejazexigil.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/lapizixax.pdfIn PDF document text
    • http://aps-mes.com/files/file/pegunebexifiwil.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/76496885159.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/4c1d976609d97f0bf7c9283d93dbd99c/1857572943.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c902d045f2cbeeadb1bb4ed6cde4dac1/74481270575.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d0b8a7369---86645453170.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d92feafec---sisumeviwilolekevaxinis.pdfIn PDF document text
    • https://cooperspick.com/files/24189245375.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/729bef39b87bc230f2fd602feb03fd69/levofijiboso.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ee701396eadcef45bb83ea72fe61370f/dotufewuzigitilikovi.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/lileri.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/87jqdu0nh3qcle18i91mn67bfr/11102768434.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_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 10480 bytes
SHA-256: fdcc42e696668cebd34c5d4cb6eedf86ef6c1ead75520426746aaf7ac896732c
font_01_sfnt_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 17988 bytes
SHA-256: b41a4a0ed52ccfbd28d77b1b3fa635776fc0fecee1cf2c947cb8a89d9c26543e
font_02_sfnt_off000122a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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