Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5c58c57bebd4c1…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 11:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a010a230e372f1748fa65f1fd228cc6 SHA-1: 2b323c6c0da553d030ec29fe65bdabf7a8762c73 SHA-256: 2e5c58c57bebd4c19f9ab8fe091ddff46ee6127b995c0ae5265ed898ae470efb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as containing a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan variant. The primary attack pattern involves directing users to external, potentially malicious, URLs.

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://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/datowuwuxitetasufagaso.pdf In PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/2248520450.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133456526d5a---28909464035.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/44783725326.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134875b67dc9---romagelodililipupumo.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/budirinifotapupika.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/ninuvonimalusob.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/nefeloloto.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/65213646163.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c6120dbfc517a4a2146b1d18629f6bcb/73940688278.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/27168857272.pdfIn PDF document text
    • http://indexone.ru/upload/file/bururafuriwedukozitatapu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16139e86f708e7---xipupi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138be0a7cd84---tapobebemofozuwomoz.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/af3e7e37c47f20b2fa11a131fae8c79a.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/42259625329.pdfIn PDF document text
    • http://pnalog.ru/images/file/vabuvipuvositowepela.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/daxojekujobu.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/13807909173.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/lizisefut.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/wefazatawom.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/61588089691.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/rugegegawoxoroxeg.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/7488617456.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/wipemegedototef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=samsung+tab+s6+note+taking+appPDF 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_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 11024 bytes
SHA-256: 947bdb71bc9b6222ccb631cf13a87f83d62881245b12c6d315fc75ca8d025e2b
font_02_sfnt_off00011120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11120 17624 bytes
SHA-256: d7de40d010a208704815955c8ea6441a4970d0f3d452d7dea5af9d05340a2566