Malicious PDF — malware analysis report

Static analysis result for SHA-256 19186c72f74dcaa0…

MALICIOUS

PDF

85.2 KB Created: 2021-07-01 09:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 29c787f02eb4b0fee20359277d3c85b2 SHA-1: 756ab6efa9edab3fa78acc428d308246ecbd0181 SHA-256: 19186c72f74dcaa0e5aac2dd4f31ffd098d7465c2a017cc47c0d6713679be5bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier as malicious and contains heuristics indicating it is a link farm hosted on compromised CMS upload storage. The critical heuristic 'SE_SECRET_RECOVERY_LURE' strongly suggests the document's purpose is to trick users into providing sensitive recovery information. While no scripts were directly extracted, the nature of the PDF and its embedded links point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc23c454344---retemipagag.pdf In PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2ec96ecb9---vugejufubevekit.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/97525377546.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/a21293cebd3af35ee9459a9d6f6da226/gevivezani.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/zasikawar.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/kraqnt9ut7d6qjmbmk9hu17qd6/46042112803.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/cq8thp40477kju99970m1rmn14/72310561524.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/98953601362.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/fhb2vvo3td0fpjd67tm2onse0r/tipoze.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/xapevuleroxixi.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/39791798346.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/43850206982.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/purasexo.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/xovomeburotilozupug.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/fd90f6798a865a08a1173cd77fb25492/49570058984.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cdedeb3e6---nosepibebenikuveburomaja.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/04d5faef89710d03027d9090bcaa5fa9/lunuzobubiwiwezatokuxanek.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c3f258763---38889028901.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924e8507f4c---pupasoj.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/50fd7bf3c4f0dd96c599bb80d268cb03/kifejexebeji.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/dd0ef0cb70af2b025dc6e954a53771f1/91320410964.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/91428945853.pdfIn PDF document text
    • https://areicon.com/images/file/57579454923.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/292299959a979dad639b9baf74d29ed6/xefetamizaraxowaselos.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/wovidujudeterove.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feef369d2d---56486250405.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/eo0aioqqsg2vnk4lidt9v4s4ah/bosidinomujodizowaxotis.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/dinuribukenox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cryptography+as+a+security+toolPDF 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_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 10792 bytes
SHA-256: 034fcabe9e68fe3c15d22ed9de2ece2bc5d678fa7c8d219413196df29c25fdef
font_02_sfnt_off00011961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11961 16912 bytes
SHA-256: 0de2acc42baf49f4ac28df3d977040e6f08effe294fa091740f0523288fcb177

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