Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be07de310c6bee8…

MALICIOUS

PDF

110.2 KB Created: 2021-09-22 15:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: de78a45d4f270a3444bd80239a71e7b4 SHA-1: 4e0bb633bb080cba618500a0ce7df7d7d4be8978 SHA-256: 8be07de310c6bee814145b9826ea45790d07335fc00479b7d1e6d23c45675fe6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://oniceh.ru/uplcv?utm_term=index+of+the+mentalist+s03 PDF link annotation
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3a30e0f06---fatedawetusu.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/31503799950.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/45900076966.pdfIn PDF document text
    • http://robedecreateur.com/img/files/37566198596.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6af5a31dd---21345839421.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/jipovokuferomekixexowi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/75b0bvdqanode9auru2kkd23hc/79842010676.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/wapinurazuxiveg.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/13269253932.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/tasipas.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130d0b2929fb---14284161828.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/coqed678bs2a96at6ucgjng581/vurulaxidenutamixipesax.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614110aa01664---37555519225.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/de435f4680ddd5a1fc705f195d1b0fd6/mefodegigujaxaxeperuk.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/20153564641.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45600693736.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/5258496785.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd7203c25c---kemegoxotuven.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/zojogapefitiw.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcb51b29c9---61937867866.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/7396441609.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/2238470374.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/8096561625.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/41835061220.pdfIn PDF document text
    • https://harom.ro/files/file/26255360190.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c4d644adab1e9017ad729386212ab36d/juzolurezurilimuvusipoje.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631067303_4d977d22db.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_off00014841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14841 18868 bytes
SHA-256: db06f336263976d899e4d7cfa0a05da49f628652ffaeae8f4ee6f2a2ad570975
font_01_sfnt_off000179a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179A6 10868 bytes
SHA-256: f9ae5c8f209759dda0109658a11d40ba375429687fd9469d2a123c919743a9d7
font_02_sfnt_off0001929c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1929C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1