Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f8c6d293fd9cd8…

MALICIOUS

PDF

74.5 KB Created: 2021-09-20 22:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46e7591be082aefbc10b625adc3ca128 SHA-1: 2d90f83bc8d34bf0a9a6c99b59450ea2a0648ba1 SHA-256: 48f8c6d293fd9cd8e31eb21cc4c77c46bffbd1a7f6fb7d49d419208f2b0e95fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://longbeach.ilovepokebar.com/uploads/files/mufipasamisimaneso.pdf
    • https://777mto.org/contents/files/36566281414.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1614370aedc4da---getamemugitanebenakemu.pdf
    • https://agri-mal.pl/userfiles/file/63962858311.pdf
    • https://matao.ro/app/webroot/files/userfiles/files/vapelejidesidifarikuful.pdf
    • https://ooobelkom.ru/ckfinder/userfiles/files/nemoturewokarokelibaveze.pdf
    • http://tsutae-f.com/js/upload/files/58024022683.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccc306b797---kutenadodiw.pdf
    • http://otpetye.com/images/shared/file/39069327575.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2fr3iaumagf6ee7mq2smnq0j94/bituvufuradexirufiginur.pdf
    • https://mimpidia.com/contents/files/kekivovumenujopofukugu.pdf
    • https://pracowniatechart.pl/fckpliki/file/25050745165.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f0f89324b---negogeno.pdf
    • https://ipkameros.lt/userfiles/file/50259746728.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/degubegajeneruvedukafo.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/mr9gjhb6k93bqoh85as7vvs0c1/49413958454.pdf
    • https://europartner2.pl/uploads/dumaximinolez.pdf
    • http://flooroverstock.com/admin/userfiles/file/zuvuduzaganu.pdf
    • http://euroear.eu/ckfinder/userfiles/files/72460309368.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161429fed26b96---99013065403.pdf
    • http://lnv-cnc.gr/userfiles/file/jepisafekegomakobuv.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/48ba5634b889d834ab2242b24199f47d/31120661512.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/bebodewoziwavamatikofene.pdf
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/53298952157.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=standoff+2+mod+apk+android+1
    • 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_off0000bf24.bin
07a8ccb0531e52aaeb4723edc75bf0badfec6a659baf34b87d291d9898b80dca
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF24 10652 bytes
font_01_sfnt_off0000d794.bin
6e53cef6ea44daa7057e395480e8f0df5c65d88ccce62a8556532637a7746918
pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 17220 bytes
font_02_sfnt_off0001042b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 16792 bytes