Malicious PDF — malware analysis report

Static analysis result for SHA-256 d247f1640512e19b…

MALICIOUS

PDF

83.7 KB Created: 2021-09-11 04:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 557c41c473a73eb0a21ae11ed2435d72 SHA-1: d26a2f6e04f4044579ce30a713a34d251b1486cb SHA-256: d247f1640512e19bfdc414be2b444dbffd1fe91388daa14150e2a499dcd26b9d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample was detected as malicious by ClamAV and an ML classifier, and it contains heuristics indicating a browser extension installation lure. The document body is heavily obfuscated, but the presence of multiple link farm URLs suggests an attempt to redirect the user to malicious sites. The SE_BROWSER_INSTALL_LURE heuristic strongly indicates a social engineering tactic to prompt the user for action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gz-theoutfit.com/UploadFiles/FCKeditor/20210902015151.pdf In PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/posumofizivuta.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/sovadabawajegevag.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/67072039029.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/75369411597.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/59577200927.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c354d876---kofazidev.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-7/20210907015431222008.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613634e331f61---2016721809.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/gobidoxite.pdfIn PDF document text
    • http://kcharp.com/ckfinder/userfiles/files/9600870759.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/60974323536.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/dowotugokuwini.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/niremuruwoturesoz.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/31970867104.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/zokisepizopug.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/92839849084.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/fagemaguzodavuze.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/7bd8380917ba0bfa978eb02c55c69091/guwumuzoperotexinu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161399a66e0b46---nekomija.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/lobajolimesedasewarasuren.pdfIn PDF document text
    • https://nexusmediation.nl/files/75466772063.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/29770932893.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/romuja.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/11934249735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=chrome+pop+ups+on+phonePDF 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_off0000e433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 17740 bytes
SHA-256: 4cacb59a39b40e54dd0c44fbd1592e45ff203a2b1b136fd20707da324c4baee4
font_02_sfnt_off00012a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A24 10252 bytes
SHA-256: d18469c3f0ed93e9326603f94d8fe2e328c1f8992a0f2a6a0880ff291b57bbf7

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