Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc06c76201f7db2d…

MALICIOUS

PDF

68.1 KB Created: 2021-09-25 22:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8df938218f308788829fc422e38ffb59 SHA-1: 35fd188856f3a2acd5c47209ab7726e6fdd009bf SHA-256: dc06c76201f7db2d0777655b4ddec10ed2ea09f703f329ba07bcf62696202ddf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://redeyeldn.com/userfiles/file/latuxo.pdf In PDF document text
    • http://re-media.ru/foto/ck/files/tejuxosulopafi.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/96764843106.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/27335788619.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/kevukipezekujov.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/48320993785.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493c369e54c---40327512382.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613375573d0f2---5521355584.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210908045806-dilivej.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/72125748846.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/hvgegii4qi1ejbf1g0pff08jmu/xurebulawenemifofetofufis.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/25083375026.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/76553772813.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/pepaban.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/motetomopugexabomosodebe.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/dokikenezikomafapuseda.pdfIn PDF document text
    • http://halaljones.com/uploads/files/71923197292.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/78366192360.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/pajavopowewut.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/sofaremozipomopasiletaro.pdfIn PDF document text
    • https://ghnservizi.com/file/23775280299.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/52530541031.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/60798964900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+craft+123moviesPDF 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_off0000ad4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4D 10824 bytes
SHA-256: 30a2ba36ff742f02a1d599cd0d03418d9f9c0d61dc96c91dc5c2582a5047dbd9
font_01_sfnt_off0000c683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 14780 bytes
SHA-256: c981608ba986c0115fce842df522da1d67cf59f5900e740fdb1bd782675747a9