Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea712e1bd5dacc8…

MALICIOUS

PDF

72.6 KB Created: 2021-09-15 13:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6547c41c3da1c9355d16a859bfa235fa SHA-1: 81e2156fc92e14ec991c6b17cedbc1f95643819c SHA-256: cea712e1bd5dacc85efda38b0051b1d0d75f9388e6dba20b6bd56823cf4e956c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose seems to be directing users to potentially malicious external sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://synerhu.ru/uplcv?utm_term=dover+beach+summary+line+by+line PDF link annotation
    • http://driver-jazda.pl/upload/file/48142777925.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a368cef27d---56454546726.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/59475446074.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/bbe68di9ufoe29gkm3kmasqba3/83018300272.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/36058595940.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/6821479565.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/mafosopeliwas.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613265441d479---sazixuzixadiwapupugow.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72495849198.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0f66a2589---fatila.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-1/20210901160137618042.pdfIn PDF document text
    • http://methese.com/upload/files/32228232782.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338a945ef82---lefadugegelobitaxepupa.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/nojofifoxapexenoromun.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/tovefigof.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/96339615223.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/makuxo.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/77372971776.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b69f1192609beebc915fba98cb891f62/95678636243.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/kenalafijupaz.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/xagidazuledunutikuvupezu.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/48640170645.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/48732038354.pdfIn PDF document text
    • http://ridendo.cz/files/file/52725997336.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/53133078364.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/zodibidupitewewalezut.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/21440136298.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_off0000bbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 15584 bytes
SHA-256: 2de322a95c11b26d25bf8f6b163155cfcf7126bd014a4435205c737b502a6bef
font_02_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 10820 bytes
SHA-256: c099bb3be6c14cc92240ab14e2812ddc2c2548b1c68388b2d237ae928619b11b

Open this report in the interactive analyzer, or submit your own file for analysis.