Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd890af11a0e6152…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 02:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 51c8683f2a19ff51a1c2a5547a3ffde5 SHA-1: 3bc26174e6762e2426db2c23da0b1d83d71f37f9 SHA-256: bd890af11a0e615249fb573ab61e3d8e95e5ee23ba3461891fdd0d26a66a6db2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, many hosted on potentially compromised domains, supports a phishing or malware distribution attack pattern. No scripts were extracted, but the structure suggests a lure document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f1808b68f---53993010071.pdf In PDF document text
    • https://dbjadow.pl/attachments/file/79263337427.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/gosugi.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/verusagipipedinixukodogor.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161118cf0d3cd4---36948981881.pdfIn PDF document text
    • https://12waktu.com/contents/files/49437456815.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1dbd3bc2694fabf571602d45866ba6d5/93250467568.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/13851386300.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/jixuwasegof.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/55b3spha1c9tnq8kf69cp5vb4k/xubif.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/27924713432.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/soleranegezelaxegutufugig.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/detiwi.pdfIn PDF document text
    • http://93564497.com/userfiles/namopumomow.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/gokubojifolepekifumo.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/22579185214.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae50fa30bf---80322638474.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/90131163801.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611a434e17378---90601229248.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/q1qrp3vcg5prmu1df97i0mhrms/dokonamasuwumanobaza.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/65033447844.pdfIn PDF document text
    • https://kopari.hu/files/file/58721610986.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb34fc1dd9b---79471126171.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/78152913323.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/20862008162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gmat+official+guide+11th+edition+pdfPDF 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_off0000d3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C4 18340 bytes
SHA-256: 7e73f5ad9811acfa77e5ac5b83f13b86e8a12d0f64c3f6ff3d9f82f4a173377d
font_01_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9E 10988 bytes
SHA-256: 53ce0e307c0b090653b541f38cafa5181bba9cf2bc4ca629e8f5afa8f14f5660

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