Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b64f3cbfa34543…

MALICIOUS

PDF

86.5 KB Created: 2021-09-15 15:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: beab0e1f3656e2fad207fc7d27e843bd SHA-1: dcab3592d37acc3ecc84473540485fa36b85a87c SHA-256: 30b64f3cbfa345432ffadadf0c048ab1882c3b74baa59b26b3ba43be73039aba
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, likely to distribute phishing content or malware. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=carrom+king+apk PDF link annotation
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613335bc243c9---70617797014.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/kedimuxuvawupej.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/84192192059.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/jibugoxadixofavelur.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///26194473645.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161365adde6cee---bokijaxo.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/bovijezidakovomi.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/17313764884.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/bisiriwotogirosu.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/jemozovurovadamizawowuju.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/74278478733.pdfIn PDF document text
    • http://anm-av.de/uploads/files/wuxarofaxanaleko.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/11248197248.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/mhdmptaumegde89t52u0tjqsa7/padepanitidikudulibi.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/sasuv.pdfIn PDF document text
    • http://ternovykh.ru/content/file/zelofuxilitisu.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/netajajogaselowomabib.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/botareragaka.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/38828638592.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/24817345418.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/55036216881.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7373d4ce0---vefuwepegiwurulebojavagot.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/41263569334.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39E 10276 bytes
SHA-256: 2f0450ea7de8409e2675d7661c7253dd064034c2d1e674f923e47ef8bca2bace
font_01_sfnt_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 17384 bytes
SHA-256: 7322797ec0fb3bd2cd7eac589bc261ee861f6c0fe9e6a45474a33f62a6fb0885
font_03_sfnt_off00012f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F40 18152 bytes
SHA-256: c2a8f7e9482904c998ff3692745802cf5e308a6d98838ab08774b903d27a43d9

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