Malicious PDF — malware analysis report

Static analysis result for SHA-256 250cd1cfae112644…

MALICIOUS

PDF

85.8 KB Created: 2021-07-24 04:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 557af350c3d1fb837f2cac6dff2f351b SHA-1: eb4afb97d898344026ad4cdd5b855dd0e4ff75cd SHA-256: 250cd1cfae11264475b4f74ff82eb2e18faac7b0c8983d053260398a596fbeb0
96 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to numerous external URLs, with several pointing to compromised WordPress upload directories. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to distribute malicious content or lead users to phishing sites. No scripts were extracted, but the overall pattern is consistent with a malicious document designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/31488019570.pdf In PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7c4dccec---869079299.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/72576217956.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/61541741577.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-30/20210630205203213308.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/09m1l2dg3m67k7o292bdq6v4l1/rakixib.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/10427156574.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16084d24301e8c---99614936637.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/mewuvuvukez.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6f33f949047f0a21a19c5cdb3a90979d/73648823697.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/xulibarukukesonogijoge.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/68088450990.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609845bfeb06d---8571232958.pdfIn PDF document text
    • http://www.emailposte.com/pictures/wejinikuzodisisivebowole.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/vomabokomosisazan.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/pirepox.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/41202189153.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4888b12b36---tikovetuworovadusemipiwa.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076289ac8f37---89186110198.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/d0efc6c5ae9b771b8687059e4ba42fdf/52365816712.pdfIn PDF document text
    • http://www.centralperdana.com/file/betitar.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/lnt7jjlqgo50pdl7mc8t29h6ee/27949169253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cuanto+es+1+metro+20+centimetros+en+piesPDF 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_off0000ea82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA82 10916 bytes
SHA-256: ba6029935fe5c3f69be3c92c97456c53b022334966e75d853d1d922e9104d480
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 17032 bytes
SHA-256: 48b49a40ae75b3b7a7500d4434884e04f0d6b5cf155edf2b7c8b2f96649d23de
font_02_sfnt_off00012f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.