Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b94f411a04d33f9…

MALICIOUS

PDF

88.1 KB Created: 2021-07-20 15:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffa878b7651427c1841365babf33d4c0 SHA-1: 728567ce31918c7eb88c2b510ad81b1f76a0b641 SHA-256: 6b94f411a04d33f98c71c66c18ac747bf5fc1ac832f0460a74abea8589b7adf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, leveraging SEO tactics on disposable hosting to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/cbe058a2768f499c07997ce2262b1d78/68505423.pdf
    • http://alnoorcity.com/userfiles/file/64454521863.pdf
    • https://chiataiec.com/userfiles/Proj_Name//files/kinalerikoto.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/71012566033.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/f5c3b5e2d586762ba7c3346448b3f1d2/fubidonanusilarol.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160913fa3bb59a---73635960313.pdf
    • http://jjmcp.jp/userfiles/Image/file/35569911031.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/jvs2lrgjkfhbqi49992r5qkhc3/22009757175.pdf
    • http://okulsanmalatya.com/imgup/file/8751991248.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0ee73b03b2ac9347ea04dbdbe1ba3869/55998345856.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fdb6b9f03---51670954188.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/79956f768b2418ea7e03c282702f4467/88416559917.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0717/1be8c39d592313b069ac7fdd98d84693.pdf
    • https://hostingalani.com/calisma2/files/uploads/14988879389.pdf
    • https://bisnismedsos.com/userfiles/file/5377367509.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/wizomakujumubekim.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094933330b9c---xiwasa.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/55ed28125f34e70e4957fd4730a76016/50705715815.pdf
    • http://e-district.org/userfiles/file/xitupefamuviduva.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f9dcf19fb---zapodudibidutoworo.pdf
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/95853389580.pdf
    • https://hoalavender.net/upload/files/50426600137.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=my+feet+hurt+after+walking+all+day
    • 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_off0000f6cb.bin
105ec640c59b83bfbf7235fe859c6955ccb54925b926173885506fe867aaaacb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 16972 bytes
font_01_sfnt_off000122f6.bin
27edba569ee6cd56ccf4d1036078bbe2ff5afd07f3c1c853d0da25d75f3c1123
pdf-font-stream PDF embedded font (sfnt) at offset 0x122F6 10732 bytes
font_02_sfnt_off00013b5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5F 16792 bytes