Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ce4ea5bbaeed8c…

MALICIOUS

PDF

116.1 KB Created: 2021-09-22 21:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f94b94220b2e7bf06fa43aa030d5c56e SHA-1: 98ce5c22a5545add1f087f5a16bb1bc3212af636 SHA-256: f2ce4ea5bbaeed8cd9901268b24209e3cd7036fdca9ed2ffe7791d3641c32c97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

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 https://archism.ru/uplcv?utm_term=six+degrees+of+separation+play+pdf PDF link annotation
    • https://ms1oke.com/contents/files/36404830540.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/71025255488.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/15589173850.pdfIn PDF document text
    • http://emeat.ru/var/files/73060414997.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/27046465707.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94ff86b11---poridijerolejonunokenuz.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/53444102305.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/57271782879.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/89794635954.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/45989424022.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/kubawiretewaminofuroli.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16142597521c45---seselasibuxu.pdfIn PDF document text
    • http://ranch.pl/files/file/sumesuxuxuwal.pdfIn PDF document text
    • https://mikludava.lt/images/files/nikujisuwejeginodola.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131cd048b5df---45042693103.pdfIn PDF document text
    • https://siroyensao.com/upload/files/nogamanizapu.pdfIn PDF document text
    • https://dcimx.com/files/17492249492.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/jadanajakufesilej.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/loviguxa.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/sowor.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/notosesux.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/45223084091.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145dfc02f077---xomaliretepodanudutu.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_off00015b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5D 20632 bytes
SHA-256: 42979b2fa41b26558edeb95034f8bbe8f2c4ecbfa87abede05ccc0d861e1f050
font_01_sfnt_off00019190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9A7 10964 bytes
SHA-256: 370ebebe8d22f0723f7f1275b74d303247b44648cb6ccef9adf1c67660e29196