Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc20af6cf9c1e1b1…

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 05:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a9499db8953e1a0d8a2ed2afdaaa245 SHA-1: 96683044ba3a7fb51333867469edabf791496c86 SHA-256: cc20af6cf9c1e1b11bc8785ba66ede0a574549f762489d83795442828249f4d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains XFA form elements and is flagged by ClamAV as a phishing trojan. It also includes a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the presence of external URIs and the overall structure indicate a likely attempt to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://descanso.verareyes.com/ckfinder/userfiles/files/mazemebepomemenit.pdf In PDF document text
    • http://sdes.in/uploads/77323111514.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138441eecac4---57644410250.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/82099293009.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/wovufepato.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/xorukuzipe.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/vuxivirawedamodugevuposud.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/romunedediluzisarebi.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/wawowenaragupo.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/d5edcfcfad8d35a78ecb30df70acbef2/nukakadijusizubuzibemer.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/labenit.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/53549083706.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130609510f0e---41555241844.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/mozagibupofa.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/54725567970.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8631218450.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/girikinozone.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/movotapelelo.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/nigoz.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/pimazejibigo.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161407d7654e83---6558746193.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/xemofabarawipowijakapavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gotoubun+puzzle+gamePDF 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_off0000ef55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 10572 bytes
SHA-256: e6b07f2d0fcff49e25f164a1317972eae8e58ce7413157bb75c0ebc5856908f2
font_01_sfnt_off00010750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10750 16772 bytes
SHA-256: e567f5d081ea8d9ea1d442026070741f8761d2125371545c29766f529096cc1e
font_02_sfnt_off000132c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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