Malicious PDF — malware analysis report

Static analysis result for SHA-256 6658e942b71c0f33…

MALICIOUS

PDF

86.5 KB Created: 2021-07-17 02:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7168ca62d1cb1c4086133fd70316832a SHA-1: eb14e3260ba4a4b5b87662e91ee7b0fce2c6d837 SHA-256: 6658e942b71c0f339ea07423af54160619f1d8f9581533f626b31c6502a50a7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic. It contains numerous links to external PDFs hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf6bdee824---tositituvewuzukomowuripi.pdf In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c44e3a51830---72986473931.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ccd78cea0---telekitunopapol.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/otcgb4ehv4gs4neavj2rkrg594/9061273732.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/2321fd9ccc2ba546587a7cfb550562c8/30173677706.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f58c3efc7---kawipebuxovimafedu.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/pv1leuenmsp7r9r54od7bbhal6/7553275831.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a858e64e35d---27809812228.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095aef5a9238---namazevudip.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/17fd2efac8e8ad5537a201923e2fe890/5646894477.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098670e4772a---zufinogusizemapusa.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/veguzupe.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c0828299f---jipazad.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/93725166739.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/71ec614b8f5a0cc5929e7d3e37034120/repolepejirejuluxogevoj.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079371ac557b---mufanobekidetados.pdfIn PDF document text
    • http://k1a.ru/images/files/file/72053945557.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16071c5d2abfad---tadiwoxasonewaromeni.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/22837369730.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430075828966086.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-23/20210523173314802364.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/51l0svqc0qgpg9o7o5qcf261p0/42444593583.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/45869385590.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e406ddb168e---54843761448.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/nusaguxetin.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89e387a35c---68164125004.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de86d500660---37735462655.pdfIn PDF document text
    • https://andhimazhai.com/images/files/63000725929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=amortization+in+accountingPDF link annotation
    • 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_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 16760 bytes
SHA-256: 65cbc2e5511c02aed1311a2f5980357bf2a981dd1389f05a62017aef3e36f088
font_01_sfnt_off00011d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13524 10368 bytes
SHA-256: 53ea79f451cbb0cd57ec6060659313e0819886206e4b5f99579e7c413b891ecf