Malicious PDF — malware analysis report

Static analysis result for SHA-256 68819f7c37384229…

MALICIOUS

PDF

76.1 KB Created: 2021-09-03 09:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 140a89b2349125c28cba0317995ae678 SHA-1: 7a1f6738cdfd4a05c06cfdab301ffbaba64f979f SHA-256: 68819f7c37384229c3e5c1adc0d06b275c0f6942fa084dd9ab1b349ae6d011aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites, likely for phishing or malware distribution. The presence of numerous unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/28d90b9fcb6c176a46a086c58d5d4c13/dulojopuvijizaz.pdf In PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/zopap.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/1664d22392d80f0eafdc6d34d9408e46/gusilimejutow.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/xerexopamosolub.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/volemolamavixerunox.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/35777473749.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/37eb3b2e5e4bf406cff0d12546549da7/77804281767.pdfIn PDF document text
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/53704313177.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16099acd1ba1c6---97581425504.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/gutazevixekulexonanoza.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/2777996540.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608521cc685a8---pexegibitarapovolosebi.pdfIn PDF document text
    • http://bscartridge.com/pic/ludiwavuzajavaxujezuvik.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/5d77b0a840b604b35443204998a7462f/22877487971.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/15559653309.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/xivuwuguw.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/poxilamejiwegizogozejoroz.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fdd29e4eb---nimilanomu.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160822bcd1eaaf---19055358268.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7faa16497---vulofug.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/edc5464f03f6b0b04ae18acceeec3453/88363224960.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/28500654325.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/76245274790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=wardrobe+design+dimensions+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B0 17320 bytes
SHA-256: 488e401e5f412893afe07f63690304ed348ea6e27799a4d6ada8ef951ef7cb8e
font_01_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5C 10832 bytes
SHA-256: 3f8d003833559621be2019280fb0cd5abeaddf9b9cf1a43e17c56b28fefbd82b

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