Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d1da74d80a6f37…

MALICIOUS

PDF

71.4 KB Created: 2021-07-23 08:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f19a6c81b206e7641ad011615e41e0b SHA-1: 9679c2fc207453afbab52bf793306b4e9f30dd66 SHA-256: 87d1da74d80a6f37f483366a773dd340d9fafd2637e2c9f68ff37c4218cada6f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a link farm pointing to multiple compromised websites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The presence of multiple links to potentially malicious content hosted on compromised CMS uploads suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082ae026f6e3---bimivisuved.pdf In PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/53357316006.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/susugojo.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/dizifite.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d39c0c1e4---54128309078.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16092b3d3dd9f9---jarabimojumigupolotuxip.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091de139728d---49056482979.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ce116c594---maxewaxozoso.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160835f1e14286---16894293557.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/30487036440.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/13269567307.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/8808128428.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/rowixomotejoreluxile.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ade8ab7314f---leropatisirapasa.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/dokadekagazadafulinogij.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/fc313c138cde63575bdd471bc507f04b/70875903948.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/co91v98c9pe2ni3qud68open26/98349953585.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd43ed2002---zalul.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/35b36f06f2ca9948d50aaadf14a5d1cc/20308833100.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/152151324540.pdfIn PDF document text
    • https://rosycaffe.com/file/61049210772.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/vigunitibug.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/84135667692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=password+visibility+togglePDF 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_off0000b9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BC 14644 bytes
SHA-256: ce8ccd1bf288609ed5d118a83f24b97e280ef3579b42948a4e22bfa4b9bdbad0
font_02_sfnt_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 10724 bytes
SHA-256: 19d6e0dbba508922b9e9beed0457b0da2ec5e82e5f3b863755311acd92f99246

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