Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d336020c417d18…

MALICIOUS

PDF

93.0 KB Created: 2021-09-02 06:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e799521392154a5d5d02fcda177a43dc SHA-1: d833a0edf39a884fef6d7e6230c000e70e45600d SHA-256: b0d336020c417d18108581ff3a2d8cb2b800e555fc7664b88e7c68a573a64831
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, including compromised CMS uploads and disposable hosting, which is a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL distribution suggest a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/xulosotinuvuvan.pdf In PDF document text
    • http://kirakuramenandsushi.com/uploads/files/95850756009.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/fe20cfbe61f6f1c8c0f0a5f17f915d6c/wuwudis.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/muzakawusagexegenekumuvu.pdfIn PDF document text
    • http://montesantangelo.it/files/files/juburojedateta.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/62612294713.pdfIn PDF document text
    • http://emaaravm.net/upload/files/34405298421.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed01c069ed---dogonisepatetomiz.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b999ac3ab---tofilopetufete.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/dikegopamazewumifogifek.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074964b5512d---xasukoruwenoripazibode.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/960o4tfcshtip1c9fnnhl52ah0/kovogumutepos.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b51d15af3f1---rolusiregemexo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b460664c238---sewiwazojifizalasote.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbae7f33fa---56123516831.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987359f2222---83397056099.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d23e4ab2885---71754748916.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ocemsve4b7536eptc3k6898h50/91863497999.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fbb18bbe2---lipijikevufaliranoju.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/dokip.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/jisezixumapakinobapepupu.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/48511616242.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2723edbaf4e461290901f7656eca0054/6714498761.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/qub6rhfd6k8op65o42fj8bat49/wupug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=english+pdf+books+for+readingPDF 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_off00010469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 10896 bytes
SHA-256: cac7e24ac0bd33552a871411e6697720c37bd07a3cee2a2a9b9c2456f08607d6
font_02_sfnt_off00013514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13514 18780 bytes
SHA-256: d64bf321df86fbc759d55ac3c4bae841c2b57fbc17598bd334c81c3f0c43d6d1

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