Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb34578fa22f687…

MALICIOUS

PDF

74.5 KB Created: 2021-09-03 19:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0172973aaf35efddc8ac5e16d9c8178 SHA-1: e46f3e7b678d054cc5ec41a1068da569483c684f SHA-256: 6eb34578fa22f68793039cfa00485cf3b14daef8001a4312ffd01c52fbbba832
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm or SEO poisoning tactic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the structure and URL distribution suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://cructi.ru/uplcv?utm_term=2000+mitsubishi+eclipse+manual+transmission+for+sale PDF link annotation
    • http://ge-mak.com/files/pasumuguzutilovoxofomiv.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/26089811759.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609874c553f7d---86159342295.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/37451866560.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/kitowovonegexifedamenesag.pdfIn PDF document text
    • https://luminex.pl/upload/file/jitesezutotaregep.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/62060527619.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/dagorak.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/84059669794.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/zoxanefuxan.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/43944981061.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb635d12dc---25055261752.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/zuwugupijudologufiwisit.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/9504f64f43f2e9ca9c415abe3f94e6e6/zizajagefetisudelasi.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/dokizus.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/4518ecf5eb8459e6f1dc94de67e01021/74627024179.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16217936446567.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/34747672065.pdfIn PDF document text
    • http://tfforming.ru/d/files/mojidaxarezakakogig.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/70138424960.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/96348890560.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/kekibexuxedufodejo.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/13135756166.pdfIn PDF document text
    • http://mweb.cz/images/file/jujuzejitam.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_off0000bc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8B 17532 bytes
SHA-256: 4b577376c6577326d6ff57744a0386df886ed0a4b70425dfbb5eabd54125689e
font_01_sfnt_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 11132 bytes
SHA-256: bcc199aecae5c7c24378c8ef8384e69daf0f4d8b229d13b73aa540d814930ad4
font_02_sfnt_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1