Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3dc70b96bc41b5…

MALICIOUS

PDF

87.0 KB Created: 2021-07-04 03:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 416293c364dfaf6adfa8f06ca8f463f3 SHA-1: a19258221e02d206cb4ecc0947dde744bc130a82 SHA-256: 3d3dc70b96bc41b5d30b47ab292d7491b99f8002d7644300c99a66bdeac7da30
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://aawyx.com/sites/default/imageuser/file/40895599261.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/223e66923b449f80fe560794402aadf3/11773408520.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/jq5o41ps9hfskabgpbipkel0i0/kesunukodupovodutovawuz.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083749f840b2---34145760469.pdf
    • http://wxjsyd.com/userfiles/files/dodazodurubazabutib.pdf
    • http://www.contectrade.hu/fckfiles/file/zapevowi.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/bfd592bc997989a33945e083c180f204/wotukaw.pdf
    • http://commune-bourre.com/userfiles/file/37720323747.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce8122c703---27921573325.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160785cd5013cf---tubato.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9783a5a3c---bosakiviwutupizixad.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074700be8e32---tapugufuzewimom.pdf
    • https://weddingitaly.jp/images/file/17075493505.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7041e8d71---22765965644.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1c8d96c71bacbf534402ca2268f1f237/69983112619.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b08b34f3024e3fda93abd9fba23d6206/21393926607.pdf
    • https://gites-les-bardots.com/userfiles/file/puxazowusubidosajidanokiz.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d61ecab9f9760b0e6adc639c1fd4ef50/nazezibize.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081899e373ff---jaxojasikigelavufo.pdf
    • http://asupuro.com/user_data/image//file/fepuwokawijagilekavuziv.pdf
    • http://tebsc.com/clients/84181/File/tebalinakagu.pdf
    • http://arabic.cz/ckfinder/userfiles/files/31481018787.pdf
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/waxurevifa.pdf
    • http://begemot-rus.com/uploadfiles/file/2021062105173673499.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=first+stage+of+the+life+cycle+of+a+butterfly
    • 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_off0000eed0.bin
77aa802d1c6edba9e95ee494253a124a79abe81a5bf863aa2308890d35f3d024
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 17624 bytes
font_01_sfnt_off00011d45.bin
1231af214d340fbebde245135a39b18c4e9627441a49674039b633f0d90f17dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D45 10844 bytes
font_02_sfnt_off00013673.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13673 16792 bytes