Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eaec4a7be7f11ac…

MALICIOUS

PDF

88.8 KB Created: 2021-09-18 23:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fc08bda5c249814126bbdb6943e33a4 SHA-1: 81fb9c07e32e3b8f6115a2bcfc9a4def931ca17c SHA-256: 6eaec4a7be7f11ac00b4027b564316d16d07b4410aa4b7c45199d9ca75672ef1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. This suggests the PDF is designed to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/35799283856.pdf
    • https://davaocarrental.com/images/file/65693842105.pdf
    • https://rowsontw.com/shopadmin/upload/files/gazet.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed412fe6d---motiwudejomuxopobewetele.pdf
    • http://cameradungphat.com/uploads/files/fawuvakanijisafipatij.pdf
    • https://chrmglobal.com/userfiles/file/voboxa.pdf
    • http://77owship.netsociality.com/upload/files/32922350435.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c53e2ff27c9d3e08aa4d09392de540f3/23687678191.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/morogixudofifol.pdf
    • https://turasmobilya.com/img/editor/image/file/dekeserusov.pdf
    • http://lixupeng.com/uploads/files/dukedafasegesoxofobafugij.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/pnumr3hu6lb7gtnr49s2k818rh/31375484203.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce084efb6---73844122039.pdf
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/38540906074.pdf
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/5715810055.pdf
    • https://506hlapeta.com/files/file/21884807603.pdf
    • https://sindhuinvestment.com/ckfinder/userfiles/files/99956113261.pdf
    • https://tckontrola.hr/files/9186824033.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161413b9ae1f65---93228061126.pdf
    • http://uran-berlin.com/userfiles/file/pepejuv.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138a500b266e---63354314747.pdf
    • http://hindel-relax.ch/ckfinder/userfiles/files/63548222125.pdf
    • http://extrastyle.ee/ckfinder/userfiles/files/zaliforanajonovoxakifete.pdf
    • http://udaybharat.in/ckfinder/userfiles/files/fivuwivene.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ocean%27s+8+streaming+service
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f370.bin
ba4810df1ffe7c93017e65ae22597f3fe82f292eca273810aca74f32bfacc6bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 10740 bytes
font_01_sfnt_off00010c4a.bin
61fec6c08428ad14ea8448570c60ade7c907ddd97e180a2c5e687b6eb43b7285
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 18708 bytes
font_02_sfnt_off00013d8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8A 16792 bytes