Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56daaf53f64ca78…

MALICIOUS

PDF

88.4 KB Created: 2021-07-25 13:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6fadfa950cee63993d40010059738b8c SHA-1: a8ef68c3d909c7e95c1f9ddafe86a162a86d7847 SHA-256: f56daaf53f64ca78c00cfcf84d551d366ed8cd49492dd01967fcf7f80a6f5d54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://alliance-vietnam.com/upload/files/fawofurixosuditutukir.pdf In PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-10/20210710152010436620.pdfIn PDF document text
    • https://senhewood.com/d/files/70524982143.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9403cc8ace---supepazel.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/getonukofa.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/43893271974.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ff8d5763f---wunokibosudag.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/vomitinoj.pdfIn PDF document text
    • https://argumentua.com/i/file/38861254374.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/15836699831.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc769d7012---4618451926.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/50008226255.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/e706f44176020c14f2895f8a14210351/pitawijenuwamafedinasuv.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/nopew.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ef5e338bf638d5fabafdb09d6cc80cea/70725641177.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/40996806458.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/1da1eupgfve65ctajmip5sut09/88029251086.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16093f56b38fe1---dutub.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/wijuzupugesuburegov.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/68522038958.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/34919382720.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/91798370854.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/3i28i1n61okg53q6sb9lgtf751/46562227389.pdfIn PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/towemenolegizodulilut.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/wupuwifovobofamujemuruja.pdfIn PDF document text
    • http://tjclassof1971.com/clients/1/16/169b02496b2253913efe31a5b05f4f66/File/jaxomilunaduvasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=premam+malayalam+movie+watch+online+freePDF 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_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 17160 bytes
SHA-256: a7321800dd85c94badf07cab4279bf864c5c2c2af9a344c55940838d5c983fda
font_01_sfnt_off00012337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4E 10700 bytes
SHA-256: 6ef3d99a78fb5b9559a0516018ebcbb9592bea7c062778a112368aa5ccf03788

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