Malicious PDF — malware analysis report

Static analysis result for SHA-256 795c8ed1e0a92780…

MALICIOUS

PDF

88.3 KB Created: 2021-06-30 08:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 392497eb2f76a521b3764315926a22e0 SHA-1: 864e235b998936046383120be319a335f22f949d SHA-256: 795c8ed1e0a92780d1ad3274cfb063a830a18c3b36e042cf8e900540f1d166cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/ddfbd64babd09b447e774adbf07f13bb/mowaforunin.pdf In PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096aeddd0d4a---nurizogugabezono.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1542104558---jemunetegapi.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/zupaz.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/73610421168.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/dab17e862b98d9c656edcf69b0c4a197/nagowekotake.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/diwupabawokukabegudewefa.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/pisugapijana.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/8fe28f6f49affc04c9376f3ae67c9aa3/jadawedofuxakifejuwaxakex.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/89804489781.pdfIn PDF document text
    • https://soechi.id/userfiles/file/79689537937.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/2okncpo7t1813c9aiugldmh5d8/rakolodakumov.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/cd5f0f1b3cb485159a6f5664c2cfc826/26672877014.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210503141400.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/24327227597.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/37223295284.pdfIn PDF document text
    • https://x-software.cz/data/file/90436437596.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcdfbd7ce5---mewojajijejud.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/54754552965.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/t41l5o064vmjn08o6dbqdorqei/wuzebojuwafevajimorusu.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e232b6071---5586986534.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/vuzine.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/36135498849.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/26558963103.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/tipotureboni.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609548a110300---zereremolaw.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/03a646e72ac730d8cee724b2b007eaa1/47393804743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=monarch+butterfly+matingPDF 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_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 10960 bytes
SHA-256: 5b66af0f62b8df5d7a909e35f31f7170051604ddcb6d1b685e2c6be682f4deb7
font_01_sfnt_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001240c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 17736 bytes
SHA-256: 17d5ff90350cc52acf10eb958e32489670154c07069cdfe764a5682e6c70c253