Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4786ae22b154a8…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 12:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a30d33ddc83256d765f4b50d48fe4d80 SHA-1: 77284663bb0c58b59ee3d5abf54dce096953f8a4 SHA-256: ef4786ae22b154a81eccdd3dc120d0750a47c41c27db81b99efa57ecb252a751
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure technique by appearing to be a password-protected archive, instructing the user to obtain the password separately. The presence of numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggests a distribution mechanism for malicious payloads. ClamAV detection and ML classification confirm its malicious nature, likely serving as a dropper or phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pobierzplik.pl/uploads/files/fawazowasuzimurumajudin.pdf In PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fdc8b3b39---41252762367.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210630024654.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/46266481577.pdfIn PDF document text
    • https://nasselgrundet.se/anvandarbilder/156/files/foxudiligiwukosetezovidi.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/32003153020.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082a83f1d69f---4010242736.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/87848967206.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/8fa754b94147485e348e87ecdf238458/86549771966.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd5d99d5f---benoganixiverim.pdfIn PDF document text
    • http://ballard1966.com/clients/22636/File/46848881567.pdfIn PDF document text
    • https://superchills.com/userfiles/file/filenoxabezudapenaxupasa.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/94392787417.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/64131526021.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa41debd7ee---34948860808.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/lemozefujaxogekalog.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/34295834016.pdfIn PDF document text
    • https://wrd13.com/force/file/lanim.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/7dp099b6lri4gc2ptjqh6ba534/86732751501.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c1eca91d850a6573fc068aadd18845cc/jadoboxagutalezu.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/92898716429.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/90207364570.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/39481873751.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e834c3510a8---zofegarerarodabizowa.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9a57a1f75---20975669737.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/68162499961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ansys+mechanical+apdl+for+finite+element+analysis+1st+edition+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_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 18824 bytes
SHA-256: 5f6fa1f3991830d6f2e56cdbab3e3107db649a7d0aef667539a9f68c1ba69487
font_02_sfnt_off00012c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C73 11032 bytes
SHA-256: 459938d93447d79ab1fdfaf376db8f35d05614a2b3aa5d3dad9db892b534685e

Open this report in the interactive analyzer, or submit your own file for analysis.