Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbea6832b102b5d…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 18:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8788d7b8bb89b406fb5b4c1b5add7a98 SHA-1: 9da8f0c2acc298a21e692c6f5ed4508a7c372416 SHA-256: ebbea6832b102b5decf0b21ffe0b152656390365bf72e8cc3ed518dfa41eb07e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving a malicious payload. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://drafthe.ru/uplcv?utm_term=baixar+pdf+24+gratis PDF link annotation
    • https://jpt.mysmartedu.com/uploadimages/files/78356157967.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/44879910155.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a277d9087e90e267700fa0ffb191a165/37449566014.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/gowajujepupunitaxatedap.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/zuresupagodugegesoziribiz.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/kosag.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/milexalavev.pdfIn PDF document text
    • https://onwater.my/uploads/file/55132213824.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/57889992205.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/6095276792.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/88709602330.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/58157836404.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/10347617936.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161302f01a064a---44045476429.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/peribososixawuzizu.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/tabapa.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/sepizalufulajod.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/mifodoxagexik.pdfIn PDF document text
    • https://inarsindbari.org/uploads/41861127425.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/16991148654.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/panugus.pdfIn PDF document text
    • http://torgoborud.org/images/file/gosadutokalavafaronomekof.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613897401ae35---24551977867.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/dopuker.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/zemerigelejagigenajuvol.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_off0000ca8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 10624 bytes
SHA-256: 9cf4250e85bfde694c5f5f4f9260fd4435cc8549af9343f0e16651218d3e4a0e
font_02_sfnt_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 18296 bytes
SHA-256: 4a239a24488b26b541500da3cb0ab162cc1ea2211467f35ace451e2c8856ae7b

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