Malicious PDF — malware analysis report

Static analysis result for SHA-256 01e0927ce38c69a0…

MALICIOUS

PDF

79.2 KB Created: 2021-09-15 20:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 897b3bfbad6ad1efbe396a3cb49179fb SHA-1: a8a970690245b9b381b769e68f077f2b52251a82 SHA-256: 01e0927ce38c69a0adfa463e44f5b5c86e3f4b20db2c74ab15f93665275da04c
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress sites, directing users to download other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a social engineering attack leveraging a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/bd1c8ofhgbs6528eksm5saiq64/mivinar.pdf In PDF document text
    • http://tks-forever.com/upload/2021/09/13/file/55956625929.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a7d9dd22---64445512843.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/godimowajadovoxix.pdfIn PDF document text
    • https://renteci.com/imagens/file/jivej.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/3045869794.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdb011b8e8---95423009607.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/zoxigefojezumipojib.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/46397665739.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/53242854981.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210906075413_fixg1u.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/43968097600.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/gd38lsba8gbhebob8rs42m2lgr/kibepegirenan.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/24922135307.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/zazuxeb.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/9fc006e18369d2f45351cf230c731879/51060311157.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/nafafutejis.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/76310742080.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/35484292747.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/54019394148.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/77761354925.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/46717205297.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/46185757285.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210915160607.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/5289460914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gangstar+vegas+vip+points+hackPDF 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_off0000cf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8A 10804 bytes
SHA-256: bc8295fceec2d3d6be27ba9d8af225c2e343da3dfc54b96037fd9a88cb097249
font_01_sfnt_off0000e877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE877 17692 bytes
SHA-256: 910bf1589bece3db4d400244389cfbc7ac636e87121bd409fca7aeac17391777
font_02_sfnt_off000116d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1