Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cdcb1e8a4c8e5e…

MALICIOUS

PDF

91.5 KB Created: 2021-06-28 00:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89eab4a5785f5371b2f2ae3d366da859 SHA-1: e06575850616fd0d8e00b6778edc3b84439eb245 SHA-256: 13cdcb1e8a4c8e5eb2992ad43000198035bd2ce450acaf28182007591e575def
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://beloezoloto.ru/userfiles/file/xigitirabizutu.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b798ec74246---mudeg.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be940787da3---18660709099.pdf
    • http://auburn-properties.com/userfiles/files/34082596035.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160805e616355c---zoxomevufabosimataxew.pdf
    • https://hamasataccessories.com/userfiles/files/muzexilok.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094af188d3c3---30467851763.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a74a3249d---fisitesanutamat.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854d0c09874---79846372353.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aebf4c048d2---bubobidevejevorajaroxupu.pdf
    • http://thestarbusan.net/FileData/ckfinder/files/20210606_DDF3F8A8B56715CD.pdf
    • https://twr1115.net/files/fckeditor/file/gelonebilen.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae50e9d50fe---sabikavasituxanibafine.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/ab03b50cbe3691490c447786e1e2164b/23782398693.pdf
    • https://noddy.nu/images/file/motanapudosilalododexu.pdf
    • http://eshop-kocicinadeje.cz/files/file/93608550513.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/19d02749a22639d95c312bbae6a04735/11739797368.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608700924720a---luzimenujadojupimidevu.pdf
    • http://samafb.org/uploadfilefiles/34137673482.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/4lqck3moh4pbrr7cgiublqvqoi/21238620465.pdf
    • http://zdrowejaja.com/Upload/file/xexamilipibivobizax.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/gv0ive9lg93fbrociioorg8bv7/makijapadotuv.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609eba020bba3---letel.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809cc20d400---sumigumomutuwifenur.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=all+creatures+great+and+small+rachel+shenton
    • 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_off000101e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 16792 bytes
font_01_sfnt_off000119fa.bin
6690ac80be7c077bc4b15deef6b980413f79a5d13dbae714e3ee959eb64e8688		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 17964 bytes
font_02_sfnt_off000147e0.bin
a238a535adaf907a48038e4e9af2ddcdb79fea3f472eced8b51b4b40e46dbb04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147E0 10804 bytes

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