Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae61ed74dfdadc6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-23 16:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0c70b93a9a5891de7be1580ac6020dd SHA-1: 34df2fa14e1e569b5cf78bc8cf7be686dca005e5 SHA-256: bae61ed74dfdadc6cfe2e684f3a047c691449b2ecc12faf86ef7d18ce5c3e2df
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript, indicating an attempt to execute malicious code. The file also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript and external links points to an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://full814.com/upload/files/49245407804.pdf In PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/6243496583.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfdc9d5c8f---nubelupuvamuxewatuwe.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/purafugelato.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/66244448215.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/dexazidebisitaviteguwu.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/zosudilosi.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/51813561333.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/60307571165.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/madidekisejenu.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/diroxuja.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/ludixer.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/kukidivafuf.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acaed42289---58077249272.pdfIn PDF document text
    • http://schubert-hh.de/image/file/9137791927.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/80628941626.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2cdd5bb93---17255395944.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400653a5080---47989758999.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cd512df4c---30907344440.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/86767118507.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/kigopimajatadasamisaneku.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140be4cc8d43---zupuzalabutisijafadeduxe.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/fisomepuminotoduwutigaju.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/xawelesopokelewebitepi.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/lokun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fundamentals+of+physics+extended+10th+edition+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_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 11252 bytes
SHA-256: 9b1f5a10e6d9447702eda55f10107dfaf63c4ca9d26c621593557392111e16cf
font_01_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 19528 bytes
SHA-256: f5ea140805072a00680124b62587b900309a56009d9ab8d9dbe83dfbdec6b455
font_02_sfnt_off000124d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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