Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d17e391df54eb9…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 00:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a7f07b0f224e612f5fb822bc0030c64 SHA-1: 387b320659046c345bf4933c0027a9e9477a9374 SHA-256: a8d17e391df54eb9e59d48479fe2c3fc9039b2ead33287bcf7e994b8402d02e6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and other domains hosting additional PDF files. This behavior is indicative of a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74f3fd313e---jibejonekixuvawuxibe.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/39299045044.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/fevipafugenawefew.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/40fhk0g31qbgeu47ehvb8eqddq/62857956807.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/zuwumi.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/dd2toupo43qr4dn2m0jvsg26te/winedamafoluverifu.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/4bk2h223504tmkrt8kv1k5l0cs/1866040201.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/89762595342.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/sufivofatipuviwosofef.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8ddc52e9---66139585327.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/dawepidarab.pdfIn PDF document text
    • http://www.toptehnik.si/images/nuleze.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/8293065752.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/8283690949.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092825b199eb---funipuzuzosugagut.pdfIn PDF document text
    • https://abeess.com/userfiles/file/jomuduzanuberaka.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/465761764.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c05b469a8a7---85301922123.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/kixanepejomejabora.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/e8e259c58e9245d2ed635b1c3c8adeac/xegojabiwibofomopuwe.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/275328131b40be3dd329c6363dba8c84/bodipojafobolunoxudiwoz.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/51397256804.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a11fb932f21---xexijuluwixilagekudas.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161130bc4f2e71---56443363164.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a37f1c77bd3---14701489928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=extraordinary+minister+of+communionPDF 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_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 18280 bytes
SHA-256: f157f558077c2c2ec364c8df0d45c101e3385c1254636137abd616f3880270c4
font_01_sfnt_off0001180c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13023 10892 bytes
SHA-256: a3272d182d2114e2271efcedb5d692437f11190ffde700e26b43ddb758281e50