Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac84be246b844216…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 14:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aec480a0059d5b8e60f9e6e374501566 SHA-1: d499db21248078fa59a9509670e59f68ef151d61 SHA-256: ac84be246b8442168ccadcef2890295c6fc626af0f42f5eb650d70a75487e771
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised websites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=11th+science+biology+book+in+gujarati+pdf PDF link annotation
    • http://le-bouquet.be/userfiles/files/88052930826.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/12330941612.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/35019561239.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/89204023694.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/57391802972.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/23947003373.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/36750867546.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/69174492353.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/zobomibogabu.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/21191776251.pdfIn PDF document text
    • http://rsst77.ru/upload/files/27563281880.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/68904923010.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/fituj.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143015896d7b---11658190696.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5f9ea716---6735791361.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/lozemixazujukoxepevaj.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/vubonederowevabijebiri.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/60399854767.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/vomagexame.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161432c00af7f7---kezexurajerapazubudarur.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/39721936816.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/risam.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/96785273372.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/58321888524.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_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 19076 bytes
SHA-256: a88fba94c70e5c38ee2af1bb808cac6a7ac6717b2fd7df33d7765b98dc3a1c43
font_01_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 11428 bytes
SHA-256: fdcb791561385f3bd3b8578966ef3b31bc6a332ca730167d8492e52f1ccef64f
font_02_sfnt_off000120d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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