Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3211eb698c1770…

MALICIOUS

PDF

89.9 KB Created: 2021-06-29 18:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 054778d3570b9f2d75432eef590aebe2 SHA-1: d88710320dcaf302078c38debbc153867be7ed99 SHA-256: 1a3211eb698c17709c20d94285afcad653be9ac35ff39b56560d31f4bf14719c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm used for phishing or distributing further malware. The PDF itself does not contain readable content, but the heuristics indicate a pattern of hosting malicious links on potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kbj5b5g7q8cahnflaih3gk2o90/putebomobufar.pdf
    • https://cakenflowersonline.com/userfiles/file/37293972871.pdf
    • http://ahcxdq.com/uploads/file/291026466150.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/165a809223fc63e02b80f2adaf275ea7/koxilejunuresizazeni.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160871a59d0a7c---2800680637.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c61d6b534---bavidukajimanenokij.pdf
    • https://schmitz.cz/res/file/mawibuwa.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d87f2adcb14---32552067224.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/l1te9ssmn6fqi8mdg0apc6g72d/82799072153.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/n1vqt8cdao1iojrffate66h3a2/demexerubepuzajegawakike.pdf
    • http://sjhrz.com/images/upload/File/jenedawezokuwuxux.pdf
    • https://sieuthimayphat.com/ckfinder/userfiles/files/sibusolusalidas.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/bdc80ab478b8c891234c2fa477d6d89d/62130241123.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/guj8uoroehptpbgu47n2vfu7j7/doteso.pdf
    • http://vantaibactrungnam.vn/upload/files/nezenaredutuvajowuvo.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16096c2a757d44---noragebovad.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160798cdb6ad3a---rekenimode.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a487b13d2---filawikenabu.pdf
    • http://fygl.net/uploads/file/201750194537.pdf
    • https://birudongker.com/contents//files/tusupetil.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/kmon6tjcappta5g26ichfhl163/zifokebumefofexodefawix.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077dbab58a73---nujorisejepexo.pdf
    • http://imaginove.eu/data/Files/wizas.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e405cfbfdd235354d4f02fc28485631d/kuparasikitenuta.pdf
    • https://energooptima.hu/upload/File/84657607541.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/75b7cde152049d86894e656ee8f7b22b/sodonogezibek.pdf
    • https://pharmnet.cz/ckfiles/files/files/jirolewelakewujugolub.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what%27s+the+difference+between+record+and+album+of+the+year
    • 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_off0000f5be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 16792 bytes
font_01_sfnt_off00010dd0.bin
f1015dec19d91b0a83a6e903af73518c99dc34a7ebc749142e2e4e261a3f4dd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 19260 bytes
font_02_sfnt_off00013f85.bin
0c7d6b94eac7091fc22e60b686653d5ed22704ed5adb4a216330783cad1da605
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F85 11208 bytes