Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcc3155e3f6549f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 02:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2aaa757a3a24b014ab069890748296c SHA-1: bd12c438d6ea3aeb54d9e0bf8833a91b2fe9265e SHA-256: 4dcc3155e3f6549fbe8971c63740ea3e5340a1938df51d2968380cf6a911dce9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The heuristics reveal it functions as a link farm, with numerous external URLs pointing to potentially compromised or disposable hosting. The presence of external URI links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the primary goal is to redirect users to malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://bolt.fo/public_html/userfiles/files/tedopokenabib.pdf In PDF document text
    • https://canionglobal.com/FCKeditor/file/64875607198.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1629542428xelotipomikula.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ids3koe94hvhbodjhfn0f5den0/30340904328.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9251123854---gadego.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848ecca59bb---vivadojoroturevogobiki.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/24972958261.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc18cbfc04---pumure.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805addbd80f---zumuxa.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/18152137702.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/946da721d1b7bcabbc6da23b3add0b11/donowimiro.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b6d39ccfeaaf5ca1fbf448d1f3daa7cd/xilaborik.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/gexodonokevuzifawu.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/6270477543.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/bikepi.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8a9c1045e8---78052148287.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a364b6d7ed0---12097152793.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609240e5eea22---femejizijatirebigikixigib.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/89e5a3eed63e6c5d94876dc741d283e4/97643581948.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/scg036gt4klrkttu134g801p1k/dalimetizelasagujunelifa.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0c26c9601---vusiwawavarofevefukiva.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/mizadatatenufibuzumaj.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/wojuje.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/uhgk6l2u7l8dssjfnfbo72vp0c/52000506363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=interview+for+air+hostess+questions+and+answersPDF 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_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 17384 bytes
SHA-256: c62b4d03e150a44193fddb00e6cc339c521b2723c06bffc84d208616be139c4c
font_01_sfnt_off00011194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 10756 bytes
SHA-256: baa8a5db363f8abdc3786516f4dc403dadc57f0b9ff098b07cc4497e5173d923
font_02_sfnt_off00012a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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