Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef58e3891393aeb…

MALICIOUS

PDF

79.8 KB Created: 2021-07-31 10:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 25791e610570832aea4a33953a3224a2 SHA-1: 6d8449b499908e379889daad344edafd22e8477c SHA-256: 0ef58e3891393aebcbe11d09359887f99f27d2251092c19d495e9994c027360c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to one of the numerous suspicious URLs, which are designed as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=who+is+the+project+zorgo PDF link annotation
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/dbc74522cfae520073e18b4c225406f9/4578475835.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/20352bf037a43e6ea74f60107728771d/70352883365.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/jamuno.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/51276425129.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/40451221001.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/2250796658.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qp8q3h7lgu6fi7piek9ofr8d43/tezozudinuli.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3eddf10a0---betuvomexofepojexogonasok.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/7f549e6a4b62e5df63c860ca654ad1ee/wodijimivifatam.pdfIn PDF document text
    • http://charontrade.hu/data/file/wadirakapikovivisada.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5d98j7cmmo3p6rditn4rvoi1p4/881731326.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/90407553774.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/12316054651.pdfIn PDF document text
    • http://abington1964.com/clients/865474/File/gonevabusapejenovuler.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/1d1bb8793fbe5221ba19ed15a6dc61b4/dopitejuxigaroler.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/82193914703.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104d2a538431---85623696404.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/18975944065.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210714131213_h79699.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/zidonarivuditibapujapal.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9fdbc7004734f4bd05ff34619627145b/biwoma.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608631b3130e5---98736534921.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/dl16da33p7ucvspna3rk7hsnlg/22100996479.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32d674acc---82993516645.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 10524 bytes
SHA-256: de0b91ba94b07e7945499a16d5f0fc30fea4a27bd360bd39392bb215165e80f4
font_01_sfnt_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 16600 bytes
SHA-256: 98b4a7d00913f01b47bb5af02e27f2db2b5dab6b653017c2acd3bb4527e38905
font_02_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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