Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a57f7ff1178665…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 10:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 34b50dc08311120a7d9ab86d7f42db80 SHA-1: e9cc38e6c1d3cc6e845308c7622a26092f4acb15 SHA-256: 19a57f7ff11786651e7bba25f497f97f96f49c1a5caa2d08f94b35b56b9ee208
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pm-property.pl/userfiles/file/vegumefu.pdf In PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/8045456292.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613790efd3ee4---31937065612.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/bevomikelesobodabobibatem.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///28346038748.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/talalipojagob.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zarotilisuxuxifigalo.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f50be7204---julolisubonov.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/vibuxagom.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5j7t10lp7ccq8j1sonj0ti6jh/33849283283.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86fe2ebf9---20931179844.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/53919599119.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/sopugivegubipu.pdfIn PDF document text
    • http://caythuocnam.org/images/files/wonimiperedizomajikofok.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/naxiwabidikugomexaju.pdfIn PDF document text
    • http://rilta.net/userfiles/files/xatetule.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d34b379baa---85800714925.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/48412266335.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/66898581493.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/45323941816.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/wenura.pdfIn PDF document text
    • http://videlec.be/ressource/file/89127986595.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/mibabuwenaf.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/xutevejifefopatorusuxa.pdfIn PDF document text
    • http://polletnv.be/uploads/files/74147730547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=in+cold+blood+pdf+onlinePDF 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_off0000e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 18244 bytes
SHA-256: 7f3b6d0a5aaf880c84d51bd17b107b854fd1e0b2c98c5c5716b589b5ae4ce0a9
font_01_sfnt_off00010fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C8 10176 bytes
SHA-256: ea8138ed805c969f644e73a5ca6d4a2d326feab2b46cb4258a1fb22770e7fc76

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