Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0028a507d7782d2…

MALICIOUS

PDF

113.2 KB Created: 2021-07-07 02:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4e4e2e002be9452fb59d74bd132b9b7d SHA-1: cfef1590a6eb3d40408519c60d2f72df05d24023 SHA-256: f0028a507d7782d2fdd10ae8008590e64f1be0f12a47ab09db6b693908f6045f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites, specifically within form upload plugin directories. These URLs are likely used to host or redirect to malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pistant.ru/uplcv?utm_term=comprehension+passage+for+primary+3 PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b070d0c4612---27439108161.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb803b911ab---23261195433.pdfIn PDF document text
    • https://digireg.nu/upload/73408855109.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/db0n6h8d5ifa61e777vqt38i64/20575107572.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/bamovogarubama.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/bifafusejagip.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a7e2cea72e08e4eaa8a9726963cffdb7/rimixekifoku.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a343d3ecd9d---44768645265.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084091acf6bf---bomudoribuxokugos.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16cab5fab---63726844517.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/74746582170.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/bibalomewafajoj.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/3n0odor1ci4c3hjrd4k9e34u16/dazewizimuwigazatu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609569b3c74cf---pekigaru.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/1694884908dc4464f2b3c4218efbacbe/setegoboxefatezibalejose.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/68209548942.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/87208647208.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a841fd46235---98797091055.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e8df0262---58013710383.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608eefab44388---bamofogivopaxo.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/kimiwesos.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608623597a73f---17190964591.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/cttu6oljes9tm6ban6bl89dr6a/99991791424.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/vasajitopejusuxosu.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_off00015796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FAD 10976 bytes
SHA-256: eddd15b12d9a572d27b14faf62d2154a4f2faa2793a2c2d7d13f263218425f8e
font_02_sfnt_off00018903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18903 18280 bytes
SHA-256: ba4fb57dcfad04de74a3152a216a9d5ef1425eb180ceaefdc592eaeb0a2f588b

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