Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc378c6ad37bda5f…

MALICIOUS

PDF

162.6 KB Created: 2021-07-30 11:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e4bef7928ffda7d587831073219e53f SHA-1: e86517a958d5cc60457ba5ec3345024a862d0c05 SHA-256: cc378c6ad37bda5f92749d23844c83b5cdc2ff0cdafaecd51b534c840d158b0e
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for delivering second-stage payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://huntic.ru/uplcv?utm_term=la+d%C3%A9tente+guerre+froide+%28+r%C3%A9sum%C3%A9%29+pdf PDF link annotation
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/039d35d388cc97aa6c974447248a49df/netufatitovuvusixeke.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f296467f87---72611480404.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ojf2tmi9jndokrd44hvlbacqdc/21401369.pdfIn PDF document text
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/rowifisov.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/41653879349.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/5c143505ffdcf22148b8f9c916540613/detenujabipinewok.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/gidugamuvuwaxuvupofoxuv.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8db3c2cf9---juxituziruk.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b2f75a41c---jibuxusaniwerujalesaxow.pdfIn PDF document text
    • http://grupophi.es/uploads/files/wunezimenowifago.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/66317366820.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607990438cf3f---rimigefuvo.pdfPDF link annotation
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2d1ec7bcc---56939631362.pdfIn PDF document text
    • http://juicewarenhuis.nl/app/webroot/files/userfiles/files/34489155293.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d43efa26---28853149193.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160908f212b571---piwosiwakofulumelulavukug.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/90251924447.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333c8622a8---jisapapifed.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/vewujenomorolof.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094d41406db2---fidabuf.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/lasawomigi.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca90d9d9cb---897127569.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_off000213ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x213ED 11164 bytes
SHA-256: ee5e611026dff9d0c3055a049336a6713b73978376949180f96c024034418220
font_01_sfnt_off00022d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000245ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x245AD 21152 bytes
SHA-256: 0c3933a34f80e25ec49302fe89907995b728fd12cdc97caddfddba197178aa91

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