Malicious PDF — malware analysis report

Static analysis result for SHA-256 617ae4466eee21d7…

MALICIOUS

PDF

84.7 KB Created: 2021-07-21 13:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 690c5be886d289fb47092eefb53f4bcd SHA-1: 1cdc5f126a69eb488f56e520141a1cc20186adfa SHA-256: 617ae4466eee21d73585b0752c84b0fa5920979697a83ee038e1e29057478b96
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs and link farm structure indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thaoduocvn.com/userfiles/image/file/sesirilusomujarefitotibi.pdf In PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/zoxedawawuxeperazuginomob.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/nuledevorukenesub.pdfIn PDF document text
    • http://indel.sk/userfiles/file/26816538429.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/rumimi.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/94022698319.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/94aa76f81b8a96d9d0355522a12296b2/93838319581.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a81ec3ee6944797afa7a9cc15db23104/jifemunaginuxolukusori.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/3a237bfdd5849167c1bb56bb697815f7/59896589689.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/kepuk.pdfIn PDF document text
    • http://renovator.cz/files/file/7811320978.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/23828119617.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/27839282165.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bb5f95f9a---6239183266.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a0930214---32693356765.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bfc4da0c4---45060745616.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097836398969---95845158170.pdfIn PDF document text
    • http://atek-ent.com/upload/file/zofok.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/lunasor.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d207e064805---parimeduse.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/vb3m2se2vkfhlerp1hql7uet25/kosara.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/togifir.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/linefudijazaxis.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/liwuvakavetapafuwomufig.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606e744c4fc8e---42233038381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=test+for+beginners+in+english+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_off0000e962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE962 10716 bytes
SHA-256: 87e9c17f4e5b1ca5ff8ed36f30f7442007cc03092be0099647f85662fd12039a
font_01_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11984 16816 bytes
SHA-256: b4e09118d75557845129474e8945c9607cc85d72217157384395c8f412a7643e