Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffce19afeeecf52…

MALICIOUS

PDF

71.9 KB Created: 2021-09-20 22:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c41d1307ab4e084e50bf50d584e8a92 SHA-1: c3196ab26e37597b8788a6393715bae44286b0fe SHA-256: 9ffce19afeeecf520a742055f6b962692ecd030995ab764fbe073f27126f9ade
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=linear+algebra+friedberg+5th+edition+pdf+free PDF link annotation
    • https://takitech.hu/userfiles/file/33385265992.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/vanovevadexotixazepaj.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/jetudatutopunusuv.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdfe61508f---84798432585.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614569be07a11---katogumoda.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/wusexuxomedifal.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/95633117999.pdfIn PDF document text
    • http://workontext.ru/media/file/27032613706.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4201b4dc0---81536778519.pdfIn PDF document text
    • https://palet-school.com/files/files/zadof.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/9056425137.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/kozokuwizafufojumut.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/mobad.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/96956143290.pdfIn PDF document text
    • http://pronobile.de/catalog/file/gesilebow.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/siximuxozorulinarefe.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/33931734888.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/welawigizakumedunaseji.pdfIn PDF document text
    • http://sb-78.ru/files/file/wusadokuz.pdfIn PDF document text
    • http://generaldistco.com/images/file/detekefapopifekela.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/23610904434.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/zesepowagos.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161444e27d4f1c---22695582513.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210911231658_j9996i.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_off0000b7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEE 10840 bytes
SHA-256: 85dc441dc0eb69433e7432b11fcd23c5311bc6d85c4fa784804654e50194dda5
font_02_sfnt_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 16276 bytes
SHA-256: fb0b2c3456c2b7fa43b1ef369bb4a7351fd76976a2ba33fc5147dc4a965ed7e3