Malicious PDF — malware analysis report

Static analysis result for SHA-256 355600444604af52…

MALICIOUS

PDF

81.6 KB Created: 2021-07-21 17:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d9ef3d492ac7bac4b2109609ee8e1ab SHA-1: 7a6867d04d8733a4a091adba35aa6da2914c2b82 SHA-256: 355600444604af5240ecd84541509552e1411abbf1af9af5fdc38c96a135ad57
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites hosting PDF files, suggesting a phishing or malware distribution scheme. The presence of multiple links on disposable hosting and the use of UTM parameters further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b99d55273fb---lopuku.pdf In PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/abcb2c0aa176250ed6438a820d352e24/xudebowaronapabusofisi.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79c01c79ca---fizukusizixefajutakobirak.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/82035653462.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/juzarorilunabijenen.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/bavowafomazeluxuzeziko.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51a27e6b2e---73309063524.pdfIn PDF document text
    • http://email-database.info/userfiles/file/kalofoxesuzipor.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/90766664930.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/80463463905.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c96aff88539---47516671864.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/vijubigawe.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/47446023327.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9aad2f97ec86ea333f99de9887c2588d/medoke.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/mimebedadaripajal.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/41709531839.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e55d93647---pamuxokalufapidinido.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/wazazasufezaropo.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/76695378150.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/qppa99aivetd3uh748mauhq4sa/rexanasuxizogukaveral.pdfIn PDF document text
    • http://altinay-law.com/images/file/vutajuvolikutorizij.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8f100717120717473ebcccf267a334b2/zipagi.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/db68dabab147718daa48b9d53e3fccf4/72714037827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=rocky+mountain+fly+highwayPDF 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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 10820 bytes
SHA-256: 9dbdba919edce5fcf35498395417d52188dc7157724c7e99c5e470b03ed99a0d
font_01_sfnt_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 17628 bytes
SHA-256: 80dd30fa0ff6c2a0951ccde6359d48c4cfc30e4957e814770284b6f38660ee0e