Malicious PDF — malware analysis report

Static analysis result for SHA-256 251915485ddf7f48…

MALICIOUS

PDF

87.6 KB Created: 2021-07-22 04:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 48e07bc0b3e7bf00790104eecf4430ac SHA-1: 10b8a40493cf3ec9d9448e640459d2524469d2ac SHA-256: 251915485ddf7f4807c2f61086763278fa03735ea9278e8b7a48b7e48fae5ffe
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites. These links likely serve as redirects for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a910e661a---89245060800.pdf In PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a830394239b---16856773075.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c12c3e4d9---26977131679.pdfIn PDF document text
    • http://ashioke.com/images/library/File/38278913406.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/5b6dda07f5d6fb83d3f8c6fbdd5a9a6c/87078606379.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/24554173288.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/kudinawuwawevitebilixoki.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe97da2cc2---8676692065.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5d5ba27d32d17c8fe75477c59778ede/40789558807.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/56762475583.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160920c4cba64c---baxelamajifixiludusikem.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078f209a7473---zevalovi.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/1929126260.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/jenevimededij.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///23890678031.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/bebawikalos.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/pakilotumogonizizepimin.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1o49b722nvf75gi0mb88ci1oe5/refemuradimokax.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/q9skq52cgvlvr9ivu1btta7ggf/84843037534.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/wokudakigarepafod.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/7620758945.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8474a4980bd42eee70fa920dbb6683d2/vibuxozupekararaneparax.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210601043629.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/lowupigosewomonujalewo.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070412455499.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/tunusuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=12th+commerce+book+keeping+accountancy+pdf+2020PDF 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_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 16792 bytes
SHA-256: 592d70bc5e88af8df0b4c6488de0a627aa84fd3a2b74027e1c61b5468cfaed3a
font_01_sfnt_off00011b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B80 11496 bytes
SHA-256: 824398cf821d95fdacec99ad7287a6f89c7e5564f7fe7c09a6b7656b90b1ec00
font_02_sfnt_off00013631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1