Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfce322210e6cf3…

MALICIOUS

PDF

86.7 KB Created: 2021-07-13 20:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b8725de5aecca53af503d3f8b7f5a56f SHA-1: 017e38052a9249cec35f2a6473b4e3d37e55670a SHA-256: 8bfce322210e6cf3ec4a49f63b144b07200ecb51b37c41df0dde0ef529e3cb9b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7ff69024e---kaxagugowuz.pdf In PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gimokimesobuzuxajit.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/60106504290.pdfIn PDF document text
    • http://digitaldaya.com/imagenes/file/19085458591.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/2725399308.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/8bb33bfaeb79964129747428e36cff90/5816823737.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/wepogosisi.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/22224105250.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/33299402987.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/33340843889.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b2555425d---30355574926.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/45tq1ls49h0q36ukf1t19d22g4/xasadekano.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/senuzugutubadufuj.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/vuvufiwomofixeg.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/95247477773.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/jelilitaber.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c52c2ee37---87936773015.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/33827705423.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/l41pbmh17t4inj8vfsjqdc4h06/66825328380.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6e5ad574aff83bf6a84b9cfd42ee8e57/63940906589.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d5383d9a52fde3fd7ce000238acb2a5f/31346009740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=food+process+engineering+and+technology+pdfPDF 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_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 10988 bytes
SHA-256: 5210d5a10c94a6a523d02b316a332eac71a6f760d238a17cdb496e31d0aa6f13
font_01_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 18692 bytes
SHA-256: a1558601e2e8dac726638165706a52c8f23c6de102008f904dacb993350a105a
font_02_sfnt_off00013554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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