Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb372554eae989b4…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 23:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d2f4bc9a49a3f60a5194050190d832aa SHA-1: 0df4c59377fb3536cac1616a8fb2ad3afdddee44 SHA-256: bb372554eae989b4e03de31cc0bb68951765a17b7194fb8208cf9db966f831ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple unknown URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a8562c1ddba685e00f25a7b1eaeeee00/dozinexofalujukejozi.pdf In PDF document text
    • http://samnakthodrahassob.com/userfiles/file/pizowigufew.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/sogexipizababexesujaz.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/8d71f49a0aab9342b5841980495e9b27.pdfIn PDF document text
    • http://northcity.rs/slike/files/30131355019.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/minejemipa.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/6239881536.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/81082806663.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/c096e4a9a32bfb004455cac757290601/juwebe.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf3054797---20568691168.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/282341227.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/kawuponisogavowani.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/42546537666.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-5/20210505095937785064.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/rowusudarubediveseto.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/7835312006.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddf7877549---64803729596.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/pupefusakavodiw.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b803444f4---10092344790.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/95701554356.pdfIn PDF document text
    • http://pgpartyrentals-decor.com/clients/9/9b/9b45d36a3a4d562467d70d81bd292783/File/77243775882.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/mubuzugipizuvafuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=movies+about+seven+deadly+sinsPDF 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_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 10556 bytes
SHA-256: 698c2f42a857dbcbdaeefe54be85743d21e4aa6537eafebd58dc854c02245910
font_01_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 18012 bytes
SHA-256: 3bedc88a772d097dea9472b80aa04b14e160a81962afc95b14cfc84c880883ff