Malicious PDF — malware analysis report

Static analysis result for SHA-256 daaa167c3d5e4a4f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 00:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b31368dfafa6a0135362d44280a14325 SHA-1: 279f0305d60c30ff50f8f2b32dc1f314d91cc149 SHA-256: daaa167c3d5e4a4f497c66ec91f2c27854d1c704a23c2723de313a8598f0c93d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites, many of which host other PDF files. This suggests a link farm designed to redirect users to malicious content, likely as part of a phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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=how+to+hidden+call+recorder PDF link annotation
    • https://bimore.vn/webroot/img/files/sisiraworuva.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/fuvawel.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/042c7643f87768364febf63245210fde/wofopil.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/rodibekuramokolix.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/bc6c1160f301c6bcb616f39d7db2d0f1/kadapanuxunidibi.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/34898897524.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/97587625472.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/venezilenisabexok.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/51779548746.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/xomivubebasupixagexa.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/losijixijoto.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/keforokod.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/47810661882.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/bipavaboxaxom.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/bekedesanek.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/98793808025.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/48369880946.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/zarawukasusozimirovuratof.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139806f9178c---relokajunidakodutexudo.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021913338547193.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d2be7a35af05dbd3dd6f0d59274a72ed/94006282933.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c660aa8b7f---32702483708.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161401bfe11138---84024673219.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/fafasaxediwuvidisi.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_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 17488 bytes
SHA-256: 9b63e51097bf7bfade66f14d50ef21f64ca97fd343889af9e39ac5a7ff46ca82
font_01_sfnt_off00010fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D2 10376 bytes
SHA-256: df10c76a7d4306f736d57777a1fac3bf68e6cb83a1f9eb0b687c65043e40ee29

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