Malicious PDF — malware analysis report

Static analysis result for SHA-256 3859dcca2bbc1369…

MALICIOUS

PDF

72.6 KB Created: 2021-09-05 10:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a97534bce35ff2ec5e75e9e96a2a3f0b SHA-1: 1540fa1550b0c610124a5df8a7c9d88fc8179efe SHA-256: 3859dcca2bbc13698fd59cb5a28f372a73203a84faef6ea1d670590c74be8413
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://metallpress.info/files/dejizipizajen.pdf In PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210729164341.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/tufinepenemakamawimetek.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/97814850962.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a602d6882fb---xopizuliwedabuvuwo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c8823b2ca---61298422366.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/fevunufiselagog.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/64754473648.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/dibuz.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/zebomofedidajuxuzopexera.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/71454741576.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/nukukawititonog.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16097a104b25c6---71589657959.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16118b7fec2615---somozadafef.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/763e8fb6aee0837c3c071ff9f09ab613/lotosukuninef.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/gudaluvumijolaluxatifad.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c6feeccac---peden.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/41598280840.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/h6qmd6ju80aelgf47co0o48kue/taroturavifupikolebemon.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074d202ed647---48237521918.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/ziwixupof.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/josasijoverosojiwo.pdfIn PDF document text
    • http://acril.ru/ufiles/files/69806929442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=balaji+chemistry+class+12+pdf+downloadPDF 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_off0000b715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB715 16676 bytes
SHA-256: 6229df70670b27d6b7e914822605d6bb6964ec9824d2eb0a8cd42a9176a71f57
font_01_sfnt_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 11440 bytes
SHA-256: 38ec9f10085e97cf301af01220d705482da62b16f9760264527a6fdc75abc372