Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12c495c9724f413…

MALICIOUS

PDF

116.3 KB Created: 2021-07-24 19:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a9ea7b686933378216751973c5df94db SHA-1: 8077e30ebe484309bc95b74625479e9f2475e543 SHA-256: d12c495c9724f413e357ac17a0f5102e25f86a021796ffaa37cb84cfd38ecd94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/c4e0f82fe9ad9498f3748a4312e589f9/tufaxajuro.pdf In PDF document text
    • http://bundoreh.com/fckeditor/files/file/27894571458.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/39700246356.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/82517643771.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/ganatokozafusalarafakuvo.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/41507100165.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/22335160b4c72f487155172c7fefc79a/kugexedusawawefopa.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/44243618253.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf0edb8c7---zinuxikuz.pdfIn PDF document text
    • http://asustainable.com/global/file/88169734649.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a40e82c766ef0bd70220e74c1fded359/23740225000.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/mutimelagasedijabawu.pdfIn PDF document text
    • http://etnorom.hu/pictures/ruxakivepid.pdfIn PDF document text
    • http://itfind.ru/uploads/file/88295475939.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/8ke8oufgm6pt9agcv7ape3628h/gopenekiboxobojafatavo.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/xapuxoses.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dbfe7b319---punikotebelasewatuku.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8da7fa0dd3---87355514344.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b29e5b1d4e1---dodexididesutokiro.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/funidemu.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/72909961056.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/023b9280a7c884e038dcef6f0194e348/82061350793.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8bb4951b3f---91395839801.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/jomumetomajeruno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=advanced+mechanics+of+materials+and+applied+elasticity+4th+edition+pdfPDF 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_off000163cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163CC 11124 bytes
SHA-256: e853130f15b69097e39bddaf5156dbe2b76b2944850cff905bafa13d90e174a7
font_01_sfnt_off00017d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D9E 17232 bytes
SHA-256: 1cf4f21990fe7392097a49f890b3615f37bbaeb1fe46667aad4d3eb705073507
font_02_sfnt_off0001aabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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