Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1033a215f911ee3…

MALICIOUS

PDF

82.1 KB Created: 2021-06-29 03:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1145a578a2ede002de3419a9ab1ce247 SHA-1: 7af855b76616d05a6371f6c05d8d1b7789020e5f SHA-256: e1033a215f911ee3812ebebba7e069d92aeca65b6f2d6fa5b2e47dcccf448c4b
156 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 hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://rocksoliddesigns.biz/userfiles/file/95555766911.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b071170cf7e---43797968591.pdf
    • http://talleresjpg.es/img/file/xogipizopowebezejizewi.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a09f7dadfd521910f7864b7dcd52ace6/73966230677.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4f63396188ec29e40a25ab1c5fdaa496/31544891190.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2393700f6---1574865074.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/tikerurojegirexu.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f0ff512d5b3ade2e73c6d2602fb8c50f/52757982692.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c028ed80d---8317754366.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d1928c5be44---98126543082.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/71269382845bda3aba032336638c1d7e/vigexasotovuveledozifeviv.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1f44c13d186360ad8656a241f1bc2ab1/37814741486.pdf
    • https://burgaseguros.com/userfiles/file/zezixijoribonu.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab261210b49---8791077303.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/3e93501007dce612dec0c97a5dfe947d/jutudojawo.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/d5lcftdhpa8e0d23jbhvlbqoc8/85672365422.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ca4950f27---87294850025.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b2fc99cb---xejapexuwazibivi.pdf
    • http://ackerviewguesthouse.com/userfiles/file/22865496985.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f767d8f5445f4050b4089aeee9fae0a7/54238345813.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=format+of+share+certificate+in+word
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c3.bin
da0bb9ee2da43ff02925c0b253fd93b01e60724db711b1a331dcb96d81773560
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 16400 bytes
font_01_sfnt_off00010ad6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 16792 bytes
font_02_sfnt_off000122ed.bin
9d7ddbf6c44f7b8abab41862653fac63575e452ccc444c7284c60c3e8ad48da4
pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 10756 bytes