Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1ec0aab61c191a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 11:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99cad33c8cc00c79cc2b397b53f746ea SHA-1: e6a3b7f2998b785141323b6ba341c99e32615504 SHA-256: 0c1ec0aab61c191a239fb83391abd33f8afb9ef0b6948d0d8f0137ec5246eafe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://crysiq.ru/uplcv?utm_term=bollywood+movie+tamil+dubbed+download PDF link annotation
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134b91f4c6ef---38957046848.pdfIn PDF document text
    • https://ckmandarin.com/uploads/68971989571.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/31301129690.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/kijisidov.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/88481038777.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133404c8d198---rodixajopakaxov.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/8496866847.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/71132612326.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/71488773106.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd9969c6b1---torobizemavi.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/23992034999.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/55662378638.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/28804934022.pdfIn PDF document text
    • http://espicycooking.com/files/file///mowoxosafowita.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/jopavaxivivirobozawet.pdfIn PDF document text
    • https://flomogroup.com/upload/files/nomugelamabexem.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/4342605062.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/65698554021.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/wogajigigajadadaxu.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/87279256634.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/31555917551.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613628005082d---gegoxivalezuwida.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69400990539.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/kigokaxifuwonikabevolabi.pdfIn PDF document text
    • https://flomogroup.com/upload/files/xaduwemitugatigute.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_off0000e3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 17624 bytes
SHA-256: 4afb60bd17f7e6f9f1cd70c8ed2206392c13373d430f5769eb08e6d7fb801952
font_01_sfnt_off00011175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001298c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298C 10700 bytes
SHA-256: 967b3eba6ef5475712062c0e1159217d475c27a0a21f893556a5889517f969da

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