Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3208d310a3e3e10…

MALICIOUS

PDF

85.5 KB Created: 2021-06-25 14:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50935d27d4d15e07cff88f04e554358f SHA-1: 3e5bf8e950e9f3be6f0304d13452ffbb70646c64 SHA-256: c3208d310a3e3e10e5dc63d3c2df212c176df301a7c74122a02db465413bec9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd0eb2ce1---55145821277.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c564f4239---rumerizukuwituviburilam.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qkice7lpdjlb2vgdb4o8l351nc/90023820222.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a7dd3c94---sovabevowoso.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090084151f67---49189118334.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc90d0ed9---86060522031.pdf
    • https://shreenathtechnologies.com/userfiles/file/98399316563.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2e2c4880---gesuguxile.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/60bb3c01f28996837ea4a3f17741ceea/tiruvodokiga.pdf
    • https://badoza.net/userfiles/file/vabibas.pdf
    • http://westernmaki.com/uploads/files/vuxusekijarejuwepibuwegep.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/59ad80283c20ef7604661318a64c0e24/lakidepupexewinuruziwowan.pdf
    • http://agnieszkapawlik.com/userfiles/file/52602563451.pdf
    • http://gourmethousemacau.com/UploadFilesfile///83029636650.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd5b09a20---tezexemufebodizawovatovas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cut+your+own+christmas+tree
    • 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_off0000ebe7.bin
a98d657c7e491abef1eefc568498c2defdfbf3c61b261cf2ece759b6a895faf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 10780 bytes
font_01_sfnt_off000104ae.bin
fb2ad892c16cb70909782e5db5090db39786bf1bab8ca975b69516b68cf7e7e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 16628 bytes
font_02_sfnt_off00012fd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD3 16792 bytes

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