Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8d41a21317c0ee…

MALICIOUS

PDF

71.7 KB Created: 2021-09-18 18:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56b124a0e1933cbf2a1ea0ac59fe605b SHA-1: 92391bc774618f4e9956520a1538af90d38b09e8 SHA-256: 3d8d41a21317c0ee84bf51b44966a535ccd077d63f6ba8a38b3f525d8858bd0a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are benign, are part of a larger pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://elcivan.com/admin/UserFiles/file/78734756188.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/mosedukigodabalepotolu.pdfIn PDF document text
    • https://congchung7.vn/upload/file/95311443431.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/cb6fec483bc062cbfe89e125c3bec346/44889892997.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/zuvojometixizi.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/31484984299.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/66063988211.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/64918270111.pdfIn PDF document text
    • http://aimic.com/userfiles/file/16001368759.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/53873359482.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161408ae95090d---xarizuzamaset.pdfIn PDF document text
    • http://scsychem.com/upload/files/rodezasepapekizus.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/94877507046.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/53403796723.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/voxodapowas.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210908_015550_154.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/42786134483.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/modowagizodapakegulizugav.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/51523149612.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/41092579453.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3cde4683---10027291007.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/goloxegupa.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/padigodezanes.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/56203640041.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ebf406561120ff9e86e77cc80ae08333/wuzejulejiwelusu.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/4204147568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=vlc+playlist+androidPDF 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_off0000b9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AB 15512 bytes
SHA-256: 37ba9aa600a7cc71393c1656fa2c0416d833e925e23012f96cca0fce3835453d
font_01_sfnt_off0000e11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 10456 bytes
SHA-256: 61f5381fe0bbaa4b5895cc587ad69efd3e39fe4a0224ce840fae2497538ab6da
font_02_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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