Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcaaab26eff12fac…

MALICIOUS

PDF

81.5 KB Created: 2021-08-24 06:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5496de205150b4c8bf5049b1b83e4f05 SHA-1: a368b0bc014e21e3c76d722aaf9dbfce8460712e SHA-256: fcaaab26eff12fac4ce997a714942bdd7d22422c1339090a091b0ff866178981
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3bcc493414e8e03dc9bb23c45b0f2325/bifamifile.pdf In PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f360fc2f0a2---metarukilaxagamimipa.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/19140343237.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/44650424686.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968e7fa9d32---10213824031.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/zijisizesagin.pdfIn PDF document text
    • http://headrepublic.pl/images/files/84372721114.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/guzevof.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/20631167913.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/65414966707.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/81288444304.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9f88c5b4a---49378785068.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161147d1281904---48638851708.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/80587745108.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/72690737264.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a66b4152e98---38596202166.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/fujetadavozub.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/nmvgmac2goae9jp7757fcb1jom/dewogapezarakefigi.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/zujasakakuzitogekudov.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/rm54bnbpvc0tjokeur1ab5rdpm/16842346808.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/zagorularelotajufonagaraz.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/55e69dbb307c0b6097297b630b55dd73/54450745853.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/fcd1415205de6b180951602833a4cef4/lufizafometinut.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/39lo8a7iu4h02otp7lp7f17es4/33061425618.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/72932290993.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/niviresenotefejulodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=comma+after+name+at+beginning+of+sentencePDF 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_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 16604 bytes
SHA-256: 3781c48542a6f58a3974a01227900137dc1d19efb4f0940381703c8b63391117
font_02_sfnt_off00011d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 10804 bytes
SHA-256: f211a3d33e6613d4c1b2341f79a2ce602bfa3417e4d3b9c34b6e630efdfcc5a0