Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08d44f74a5ec714…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 18:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55684f0fb71c2375ab817a13c4c749f7 SHA-1: dc83f851dda54fb550b145d589194c79e87d5243 SHA-256: a08d44f74a5ec7145316918a56bcdd35bc34279bc66fd3ef73ad9bf8b5294beb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting domains, a common tactic for distributing malicious content or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and link farm nature suggest it's designed to lure users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vaynhe.com/upload/files/29494091603.pdf In PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/tusoxixozab.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609787b476891---lefazozukegifi.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/loruvexagezut.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/zavinodibugosezunemol.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/384nsr78tlvgm8sssf2doornkm/99698834246.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f719580878c---janekovurepokofinuvexot.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/48038638975.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cdd47ae5a7afe2b550443f6720475efa/tizudemezepufosumu.pdfIn PDF document text
    • https://vestol.bg/files/file/jawinonumemujox.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc0f1033ec---fezuwemelemedo.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/77834362625.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/12308580638.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/11527897849.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/31332296481.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/71787770888.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/40268382231.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/kejofofajokejuvadi.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9f2cb2da0---lulezekamararonemalag.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/02d21d461a8fec5e9116e3f9e0812fe8/xonikikusemas.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/dafosox.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/de69a4e0be835a5b648f96e1b91ed835/rizorevimiwukoramimom.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d247d1f27---rudalalipavetatanafa.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/61328110883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=terapia+cognitivo+conductual+para+toc+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_off0000c4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AF 10756 bytes
SHA-256: 126f7e8e86a63a4c22df0461012c90be1390c802e040a2cc789aefeb0d55b940
font_01_sfnt_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 17476 bytes
SHA-256: ffd4b7bc511b9456ef57ab995d1e6dc642f5eabab701cfd554b690f9873eabd4
font_02_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1