Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7527c5d943647ad…

MALICIOUS

PDF

92.7 KB Created: 2021-07-13 19:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2a0423967afbe72790a78f787d2f3d1a SHA-1: 93f5e32d7294a32688f0d528db819349af6c4248 SHA-256: f7527c5d943647ad843323a290909bf4a0c31f75c631ee5ca5dade957ef140f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it is designed to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cbdc.co/uploads/ckfinder/userfiles/files/pomoziluxumibigis.pdf In PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/41355170807.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/mewomuvupejetefudezona.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e76dd71dc---jamaroraba.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/susenoviledanuliriluzoke.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/8319e63a451bfa909466aba4c6b748bb/38396822813.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210622005739_401920487.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7fd134f33baa01bf5130f2f116350353/jenusizafuzituzafom.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/sivubigebidejekisuz.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f30bde56ef---30248794179.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/30352106773.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/v9ipg570frfmpg0f271q8iqf6n/kobanelimatiwu.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/fopobanawiwega.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/dbfcbb26e9db5b8387caf1690523893e/37905027530.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b5bb8da6aaa601efa5212f77131783ff/wagubapivinujajo.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/92514212382.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/komosebulijubesosikixafu.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/be93a9d8a237089709166c8676eb8e04/90218415156.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/velobelu.pdfIn PDF document text
    • http://geodez.com/pliki/file/76067099580.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/88136968370.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/legilolinuf.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8dd2251df---rozifenoderorejadij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=acrylic+pour+without+floetrolPDF 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_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 17876 bytes
SHA-256: 8a84fedf52e945bb47dfb26be7793c6a6873b6423a7a34d66482815c0ca69a71
font_02_sfnt_off00014dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC3 10424 bytes
SHA-256: 611e57a295292a7e8270ef6c740132382ea47d09ecae86363596a5118b7331ea

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