Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f9bc8ee853df35…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 21:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 041bfb37c6750a8992cc9f72909623e5 SHA-1: d72412c244724105413f60de4559a21ebff38c2e SHA-256: c5f9bc8ee853df352fcfb3253a05e1be50b6c64c173c5912d5c65908e4429109
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection or further malicious actions, while the link farm aims to obscure the final destination and potentially trick users into downloading further payloads or submitting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=ai+type+keyboard+mod+apk PDF link annotation
    • https://petek.biz/resimler/files/boxogexajanapaf.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/68325855424.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/zarijunamiba.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/12175398425.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/50930115707.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/nebotoduxeni.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/21765684079.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/mozokitosobovibeju.pdfIn PDF document text
    • http://cbstav.cz/file/telewuvegagome.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/143c72d10395abc5db994591fb1673fb/kivov.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210909093453711298.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/3255925968.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/didarul.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613487b57d918---62256439313.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/wifimavat.pdfIn PDF document text
    • http://elitvorota.ru/f/file/53555563607.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/xeredabevarixomo.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/49559688077.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/mositenevazopun.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/gavezo.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/64309423133.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613061d597cbc---gobev.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/loviveb.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/jubegu.pdfIn PDF document text
    • 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_off0000bfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F4 22816 bytes
SHA-256: e03559be4be5e0c729e9130f7e12dffed53fa2ccd293715694f43540f352628a
font_02_sfnt_off00011357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 10560 bytes
SHA-256: 2f364390b1e798b50618ba0763d9070bf4cd718e7f3f2cde18522662a246d09f

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