Malicious PDF — malware analysis report

Static analysis result for SHA-256 955c34ce25873c7a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 09:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6018bdb68266ee4d354d74007459fcc SHA-1: 514455b05dfde2bccfacec47c5919c0fe46e790a SHA-256: 955c34ce25873c7ad22a9c9e45d1b1bf29091ba4e5ffb670f5f9d9ae1179bb1b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous PDF files hosted on various domains, some of which appear to be compromised WordPress installations. This suggests a tactic to distribute further malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/133cb9704ee3bc106946edba680bdf94/megopawexelarugiz.pdf In PDF document text
    • http://marta-galan.com/files/varios/file/45788823695.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/47651050284.pdfIn PDF document text
    • http://industrialdevices.in/uploads/69082250325.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/61233434253.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf6d62c0e2---dewud.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/8640057345.pdfIn PDF document text
    • https://agermag.ro/mm/file/46678453282.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/2810353710.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/59938170294.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612b0988de096---9431823557.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/bedadi.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/barigobodusujip.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255cea72492---movuziz.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/40878647413.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/wagivuda.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/12475556129.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f701b32664---kewaserexime.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/723312a94028885f5f3a8da6cd2af9ce/voxuxexo.pdfIn PDF document text
    • https://mmszke.hu/files/file/55688407035.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d6fc3873d---gubifinojidaguguropuxu.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/or7ko1a28snotk3rko6botb3k3/mibowezubitefegidopozi.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fa8120c3dc8---dilutuf.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/45211407638.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/eb2c6606d0b51147dae8d6bdd4048633/gidugoroziluk.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb99c572e19---73058753789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=span+of+attention+experiment+using+tachistoscope+pdfPDF 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_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 19180 bytes
SHA-256: a0063c2d7301b61d9d1124a058f7cac469c2f0173bff9cfb5b953118b9c5e9db
font_01_sfnt_off00011481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11481 11300 bytes
SHA-256: cf8dc127118c3ef3dfea29dda15f12793977e93b889e5f5f6855ef3d3b9614fd
font_02_sfnt_off00012eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1