Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c967aec17a8ea4f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 13:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 61e3228868565f3d7f2d2bf1f9eb647b SHA-1: d40d4168932ca16948472f9e0f4858cc883f514e SHA-256: 5c967aec17a8ea4fd2f1aedb42de9d22b9faf2f51eeb4484b22e4e31671f7004
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to lure users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://allytemp.ru/uplcv?utm_term=deck+of+cards+probability+activity PDF link annotation
    • http://icbiz.ru/userfiles/file/minebitavetotelisuta.pdfIn PDF document text
    • http://xsjprinter.com/d/files/zobosokujugubawirujamomag.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/43327959097.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4899f40bd3674d380ec74d0d9a3ea164/futirimovokimajo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/a6f6fb6b076b16dd3aa213a50f4cb987/47781707376.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8ff8e66ed---vaxulenitataxedeketux.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/05/16629270529.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/sasivoga.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/nobokumujelukiterubelud.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/22991416032.pdfIn PDF document text
    • http://elsped.hu/files/file/zesijopos.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/28121481060.pdfIn PDF document text
    • http://orem.mn/uploads/files/20374855762.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/032334516243.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343ef078641---xatixurokelowasalegepidif.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30973450786.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/71712794087.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/ribegupiwejikotiz.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff21112f3---titobajeg.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/9847184212.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/gufuwixegakuviran.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/navakelunaduma.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/86510976781.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398646b8b27---lusef.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_off0000d52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52F 10920 bytes
SHA-256: 930339db550dbece34466a73b65a15120180038f33fc3cee42a034666e0c8e2a
font_01_sfnt_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 18176 bytes
SHA-256: f18b4754e0aba10b5c2e54d2f803e2f995c4e7c2f842a1b937110888bf07f480

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