Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4cd39f1881210e…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 01:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39708455d53eeafcd9df63becefa8acc SHA-1: d00ca4823741720c1f78654f75173fc2733bd080 SHA-256: 3e4cd39f1881210e056fc12dadb9a15e114e48a4f526ca2739e97ca48c08690b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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=redmi+note+10+pro+vs+s20+plus PDF link annotation
    • https://chsins.tw/uploads/files/202109020103174639.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161426d5448504---23592729235.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/41627438254.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/1fa9b904c50456131eb9345026278925/56676046914.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/f2bu5gjrpsvd6m4o4af0eb8hoj/xatadevuxawumud.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/tofatavorakoj.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/sd4tfmhannuu9tnh7trfk3huup/28070183868.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/vurakotu.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/deviponoruvika.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/jobenunevebopeji.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/65322091194.pdfIn PDF document text
    • http://partnercable.com/files/35555829976.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/22511721629.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/fevasorid.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/pefuku.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/9545519493.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/64b59cfa0135cdb6341774bccaf4a004/buzigugimuxitajupozugama.pdfIn PDF document text
    • https://nyig.com/files/file/8200948693.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/wezulasutoram.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7079f2347---towesefotedibiganoxubiri.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/3130401641.pdfIn PDF document text
    • https://matricula.arendic.cl/files/56650013653.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/kixuwonazota.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_off0000cd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6C 10896 bytes
SHA-256: cb41b327ef86f86e0123fc7a596a511b84444848c5e4b184f1fdaf3d55f9fe72
font_01_sfnt_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC3 18584 bytes
SHA-256: 83906006d191a60f3f1cb08f73c9c225c1e0d97a32b4d5479ef39b531b221c69

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