Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ef70a895e98211…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 07:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3c8afb4222e6bb8d9d98e9ccd623a968 SHA-1: 9d8c0ad8091d4caf22276a699d044dfc0c85c310 SHA-256: 12ef70a895e98211e32dd5e39c57b9090c5d23b18eab1f86fd279ec201942d06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abee4e5d89---gafegirikoturavidi.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/483951a38b70e36aaaab3b6d333910dd/49865206776.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8d4f2574---jopitagupugolos.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/8530163447.pdfIn PDF document text
    • http://hongdacable.com/d/files/kosikepavuxojajebo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/at2k1f8204qi2i585pcep5u1kq/16740860851.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/99345165127.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/gikamipalimixisi.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6331195f7---71940857966.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/89b7cd84b66fcea6ffe018993a536708/40730565072.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/zigixotoru.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/an767nstt5js058rerajvba4n3/65392027354.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/82511491094.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/44552927774.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef752b21dc---jilusepizobewanula.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da2bae8730---jewogaxadipimobex.pdfIn PDF document text
    • http://techbis.pl/files/file/68250311091.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/wosigezixepexakunipam.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/wagalolijalibifov.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a6e25ef98---74500616075.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/kepuzixobulek.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/03ea903c53383590e2d3a3cadbab158c/11956941291.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607338e52c0fc---fetifosuwatewaboti.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/20174638666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gujarat+state+map+pdf+downloadPDF 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_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 10924 bytes
SHA-256: 9b6b0a62a8e94cf896d301195b546b5b6917d58ac4b481d956e89dfe65c08569
font_02_sfnt_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 18848 bytes
SHA-256: af61c436f7710648b43b33a62ad3494cb69a8293f2ee726c20d3234ac5186da9