Malicious PDF — malware analysis report

Static analysis result for SHA-256 8873296c7f954f86…

MALICIOUS

PDF

84.6 KB Created: 2021-07-27 11:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 471f15123e71160697bf55ea7224db07 SHA-1: 5be167fd3a2fcd529b8e3af92216343d1e66b416 SHA-256: 8873296c7f954f863d8d8183c8dcc06f1a6f32edbe4b1905d4160fb452cf4d30
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised CMS upload directories. The ML classifier strongly indicated maliciousness. The file's structure and URL distribution suggest it's designed to lure users to potentially malicious content, likely through a phishing or social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://painttechvina.com/webroot/img/files/63314439369.pdf
    • http://bhsbeacon.com/FCKeditor/file/53987746204.pdf
    • http://vimbark.sk/editor_uploads/files/zagufilagelapuposavojezi.pdf
    • http://designerhouse.ru/upload/files/mesigamobuse.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/66470229661.pdf
    • http://sun-green.be/ckfinder/userfiles/files/fikuvadazex.pdf
    • http://polloricowings.com/uploads/files/juwumokikowube.pdf
    • http://indyskischool.com/ckfinder/userfiles/files/nonexagivolezi.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080af11f1557---19922749510.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a397ed245fc---rodumepomediseginil.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/p9a7gu6ur8jq4q7cii2dm512g0/lujos.pdf
    • http://allasclub.com/campannas/file/pumuraxizu.pdf
    • http://adams-gold.ru/archive/image/file/63939458995.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a430a7b51---wikofamaruxozi.pdf
    • http://pensionpoint.cz/userfiles/files/bolerukofusat.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c210f485a33---45121300381.pdf
    • https://celebicatering.com/upload/ckfinder/files/12627584663.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/f1ae49bf8ba0f5f8bc0e459f878b3909/93063517428.pdf
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/vizakufirugukema.pdf
    • http://24cvety.ru/upload/files/solafokemefojowak.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f43b9306fa---35188131089.pdf
    • https://dammesliepas.lv/ckfinder/userfiles/files/32404000581.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cbf3763c3---xuwuzunoladeva.pdf
    • http://stilistspb.online/public/files/uploads/files/sajuvosuvogejovopabone.pdf
    • https://gadd-asso.org/userfiles/file/61065058274.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+heal+deep+vein+thrombosis
    • 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_off0000e8aa.bin
7528809d72f47df1666096b59c346ed4dc825a5565ef46a8cc481ea3ea7f2576
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 10940 bytes
font_01_sfnt_off00010199.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 16792 bytes
font_02_sfnt_off000119ab.bin
2c418e27fee2acce0298d1b01e8730f1df2dbadf5a93c38eaa4400f260840eb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x119AB 16540 bytes