Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac75c05fd753201e…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 08:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e3feb8f855f37bf911a49d7962c37ed SHA-1: 2e13f0b7664f58529515841463f834c4adbc6e0b SHA-256: ac75c05fd753201e3632286f704910d3ca0572b6e7436d29c6ab0a6fd150c9e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=virtual+bluetooth+printer+android PDF link annotation
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614105d982031---tigipede.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/95684048889.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/53911326252.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/madolotadagabexidujav.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fb2029f3c---nekujopudate.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1614321d94db12---59068446635.pdfIn PDF document text
    • http://hidramaco.com/files/files/6949074072.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/zezowukanipirapoza.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/6354918743.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/jogivufisavi.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec0dacb3bfc4ebd6e0ac21b6a8b6f6a3/97827858917.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/fakabomabezibuwosuxe.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/gulobime.pdfIn PDF document text
    • http://gaudi.tw/upload/files/34113813380.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/kesarowovewi.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/jilejupuzikakudesekodige.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/geieub98kd1bpka6amacp6sec0/75577027661.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/vajofusefezonaziv.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/xevibumapibukirivegewe.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/62380988915.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/15852673847.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/jewagokip.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/12830541716.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/selibevavuwagefemilidesej.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/86986937551.pdfIn PDF document text
    • https://truongdongkinh.phapluatvietnam.com/upload/ckupload/files/kusijinubomagak.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_off0000b547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB547 16344 bytes
SHA-256: bf7600bd614226357706f4d573578c77dbcfd54219c681035382926fa99d5867
font_01_sfnt_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 10532 bytes
SHA-256: 8c7214d6d8d074f3c2dcf070ae3be4a975fbcc96b0e2725a381a87775c0580a7

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