Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa0b8a04828ec15…

MALICIOUS

PDF

94.3 KB Created: 2021-09-07 19:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6952d6b3398107fe8c7c07548db986ea SHA-1: e5651c15f78187b728526694bbe02835abe1761f SHA-256: ffa0b8a04828ec153efc0c77b03deffe2ca5c152691b7b0fb23d87bf2e7f3894
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites or disposable hosting domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6580

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=huawei+p8+user+manual+pdf PDF link annotation
    • http://provia-events.de/pics/fotos/1/file/76556400517.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e98d69bdb2---66943166865.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210702014331864.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/betuwipedopuzemeb.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2027fa5d11---14241657173.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/17504828376.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/bazuninam.pdfIn PDF document text
    • http://stattus.com/assets/file/tiwim.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/20285488776.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/gukefadejabave.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/0uv32c801pgut57id0po6gl7vb/64116178387.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/26018486719.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/tavodivu.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/04673fb70c1f86e847f779779b36398a/zezujezeto.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/wabumikogexutunekobojopu.pdfIn PDF document text
    • http://keacg.com/upload/files/suwogufaper.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/18560976557.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/maluzodix.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/41629283869.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be17a6cf173---12528049225.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768582b0102---62546203992.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/176e7396fa0f7edb9918a194c941cdb8/wazefoxeximunumuwiwajuj.pdfIn 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_off000110ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 18872 bytes
SHA-256: 84ab55567607831ab7c7cf72784063e77469ecc549f986e8f09b52270d6bd7b1
font_02_sfnt_off00015a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A50 10824 bytes
SHA-256: b2f03c5631cd950936dd692234922533469c5fb69a1f0f4c8cc400cff6536c47