Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2369c441726b376…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 04:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bc01500c9f88ab0816ae908813860b8 SHA-1: cf5f4ac02183c9bed7f6715a9c7f7fb65d0e5374 SHA-256: a2369c441726b3764bde93e66b071100f571a978a13ba6dba9223ced3af43fe4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to potentially harmful sites, likely for credential harvesting or further malware delivery.

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 http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/cffc665d626f56e1ed516e746705809a/68941302204.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c506f5cb---jabeleb.pdf
    • http://swaminarayangm.org/userfiles/file/wewixogijavokeb.pdf
    • https://brihat-group.com/assets/userfiles/files/63861908712.pdf
    • http://gsmontaggi.it/userfiles/files/39778901665.pdf
    • http://www.medicellbank.com/userfiles/files/loxijesuropa.pdf
    • https://alsultantrading.ae/userfiles/files/vunogubotezezuwaxedekote.pdf
    • https://thingstodobahrain.net/ckfinder/userfiles/files/3710223607.pdf
    • http://shinex-auto.com/userfiles/file/lugazubilamovijuzusefusaz.pdf
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/dujunuripomo.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f1a3b8716fad9f5c0a529e917451112c/ximepitajovojiri.pdf
    • https://justforjetscatering.com/userfiles/image/files/katememozuxuturoxuz.pdf
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/1375ca4b38894c196a933658cfda0e31/wevisujeboxetegi.pdf
    • http://emilygrilltogo.com/uploads/files/76481681753.pdf
    • http://borneneskontor-landsforening.dk/userfiles/file/59292307487.pdf
    • http://shukokai-voves.fr/userfiles/file/85125388068.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/113e38c6271dc8e1d2e9d92837057d5c/18938309642.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083373dd5548---36192393748.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=normas+aduaneras+de+cuba+pdf
    • 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_off0000e061.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 16792 bytes
font_01_sfnt_off0000f878.bin
4234bd90d8074dfd467f79290dcd9c024e64a858934721110982e7cf3e33e028		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 10764 bytes
font_02_sfnt_off000110fd.bin
d3038042f3d6115fa05e4ac14d8f23e3688c23ec4eadc29f21ace78f3ba88f52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110FD 18540 bytes

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