Malicious PDF — malware analysis report

Static analysis result for SHA-256 148bb6297678b07b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 05:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51b67efb2a1c8f07696f4487ebe83e80 SHA-1: fab0426cf60b1ab752994aa8e70967a9bb6febe8 SHA-256: 148bb6297678b07b9e1e5c6d233b20612e637ff21d742851b569bf79807ed112
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crewmak.ru/uplcv?utm_term=mencherz+ios+free+download PDF link annotation
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/31592614089.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/zanefotugofizikufifi.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc29bd558---xasunuzokumivitav.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/woded.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ledejezinarimipuxelus.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f464a40d8c---27028749297.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/13668938336.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/79461119878.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/zagipofidixuwurefolub.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/xowivakemazexatifileva.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613724f78dd73---mukepemepisamubiwaxupa.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/befutipez.pdfIn PDF document text
    • https://subded.org/userfiles/file/tadosap.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/zoxipewajiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613833d7ce06f---14089227762.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/vabuzaxadajuzikenovotuvid.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/18776513135.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/61638524196.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/dupexejitab.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/vuziturogixixo.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/fiwug.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/buxedabogiremad.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/mumovebebigogexifupikiwi.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/torubilowaromobogetiw.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_off0000e14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 10612 bytes
SHA-256: 1a6e519985f85d67cd18dd77f93d8d281bee1037a0b8f6b13011db984cadb86f
font_02_sfnt_off000111a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A2 17376 bytes
SHA-256: 4501812f6d63cd57f23fe7cf30e58a65588f379c15102c3c64316118e2a8e417

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