Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d80b7157208058d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 16:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a56d8cfc7a2378731fe183f00288e8d SHA-1: 8a645693bdfa2e90ea14fcbe9515bf4570aeb954 SHA-256: 4d80b7157208058d3d882a357dc3c61b029a01ee3c799113b4e8c2a8c3c530b4
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 ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains a large number of embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://ymjgolf.com/file_media/file_image/file/3905379273.pdf In PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e21b4e051---pigikapu.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/rujajadole.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/94290282934.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/welopuruvil.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/4662997855.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/genofagesosi.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/gotogulowenu.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/duwowiladis.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/52840001906.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/tixozomexesa.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/jepuzivumojivopimezazave.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/tazazok.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/nekugawetevojaxazegijak.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139028a03e73---juripebituleka.pdfIn PDF document text
    • http://royalgroup.at/tmp/nexapibudogabesufat.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/86565416299.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/dotaxozoxew.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021091119514973499.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4e0f2c1bb5efaa098f35aecaca3cfe8d/kuselujod.pdfIn PDF document text
    • http://cityfate.com/files/files/juxelatukefug.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/72891986850.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/pumekimurowaranogobogita.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/doniwag.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/zegenukagadugosimape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+1+killer+beanPDF 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://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_off0000cea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 10240 bytes
SHA-256: 47dfb45b09927269ecdf8ac4dbf023d1dca34e99edb73aa560e884878103bdb4
font_02_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 17600 bytes
SHA-256: 2a93fdb6db145db6265960ae0769e42d8c9091024bff39ec9fcf6c51882cd07d