Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acad0713ed52140…

MALICIOUS

PDF

79.6 KB Created: 2021-08-12 20:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c5cbfb16d22b221fb3b61444f2d9368 SHA-1: da88921da4573201ac9a16e24d375aa380cba031 SHA-256: 5acad0713ed52140748c52664f74a370fda2a6fbeb69ad91e7a8c2e773eb999d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a large number of URLs pointing to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cructi.ru/uplcv?utm_term=kuran%C4%B1+kerim+arap%C3%A7a+ve+t%C3%BCrk%C3%A7e+meali+indir+pdf PDF link annotation
    • http://barcabianca.eu/upload/file/4309513623.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/60e4f7ceb66970b42aa2d35dc7e29fd9/57062608.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da597e941fb87d72cb8d0c05a5b2ff7d/wojiserenadakupatumotob.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe8579ae93---kadawudepenusumotu.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/53447756701.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/87944172421.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/rosirenomorozufulonanowes.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/zudefoluvutevafagegogate.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/908c75cdd1f75057f430a1d8ab250a0e/44266394526.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/51692664230.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077c7de65ff8---lerupetoxepuzubal.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/dizewenafexadebanutuvi.pdfIn PDF document text
    • http://allseasonsbanquet.com/clients/868236/File/piwidi.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/95690489489.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84bc376191---65074783991.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090dd6728159---subolafupezaw.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c496a72e5e5eff80ceee0a1c60e55154/wopodajojamagiwixonemumi.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/jmjpn1471sq6tmsr54grh5gcrl/lumokofemelinefivegekaxi.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/jugoxigotibetowiponubimal.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9afdc533ed---pakodavez.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/xofamonetuma.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/gikexaxupamilasetusuki.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_off0000cd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7A 19080 bytes
SHA-256: c027818598d3139b7088c1f3ac36a2b07f0cd624cd281fedb1a3d1e22f7b10ad
font_01_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001142c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 11056 bytes
SHA-256: 05ad8e2e29649ff8f3c3eca53dd111d01feaba0e566dfd933253ab3b29731302

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