Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9a02c7b879d4b8…

MALICIOUS

PDF

84.8 KB Created: 2021-06-30 04:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9d21b80c27c5fb89434dea3adfeb2479 SHA-1: 700f2b1954f373a582d113348c0a637dd04d21a8 SHA-256: ae9a02c7b879d4b8103d6e28ec57971abbd72fd51d28ea8e3dc26516d7c82814
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM further supports this. No scripts were extracted, but the overall structure points to a malicious PDF designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://marinapogon.pl/upload/file/suwolukujixibemapaxed.pdf In PDF document text
    • http://vicorsupply.com/uploads/images//files/73149928589.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076aba824617---20878180661.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/lc9jl3h5j5eebama824arm7ua7/38353516010.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a8196878f---sevabikepunebanifi.pdfIn PDF document text
    • http://gyobel.it/public/file/90755256115.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/zolekotirulusibuzomuf.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/mupinal.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/fijiguzuzanilaluladutaro.pdfIn PDF document text
    • https://securitydm.com/slicice/file/zokujarewusudajubalub.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/b8a4fabef5ca7182cb7b175f749901a3/togitumevelexefuvinido.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e32614d1f---batun.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3df3b1704d---debajufuzolud.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f4bea1fc1---41184647052.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/fepomoxuvezigiri.pdfIn PDF document text
    • https://triosms.com/userfiles/file/50478433667.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/8504728253.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///91185328422.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/baxenafete.pdfIn PDF document text
    • http://npas.ru/pic/file/65672036355.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/563f2d8d075dd8392a51ac005556f168/36606778034.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/73161084a3c29e67be5773841134cf6e/70278204489.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/94170400516.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f7153a7a9ac7e1a987f71f178c1cf59e/jagenubimupumipusop.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/9uinnjb271ech7hual7sb0f1c6/nugazovivusij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=3+digit+lotto+result+todayPDF 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_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 10608 bytes
SHA-256: 14cc170bf9d8f33d8dc026e4325b8aa25523888350fcf7a92ab15e463a5da870
font_02_sfnt_off0001190f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190F 17160 bytes
SHA-256: 5c0f6d9fed0ad366a1412c5271285721029a62cc4ad863f1414c9152699f9184