Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbedbba24817a47…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 09:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c3ededc0b27d01525da64f5fdae7ee3 SHA-1: cd38c9e1002723e5b8967401eb801d7511cff888 SHA-256: bdbedbba24817a479a7c3ed06d4a4db4c9ab7d3955d18c2cb2d746d64aafd530
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with numerous URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggests a phishing or trojan distribution intent. Although no scripts were explicitly extracted, the nature of link farms in PDFs often serves to redirect users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2639

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://kutyasturak.hu/images/files/xizukuxedugowimedevosadoz.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b6779ad42f7c588d85349f06f510aa02/nijazevitulerotevod.pdf
    • https://pasarangroup2.com/contents/files/mafukunutot.pdf
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/merigu.pdf
    • http://kammerchor-lindau.com/file/52354595391.pdf
    • https://eclearusa.com/images/file/xonesanunufikopaku.pdf
    • http://ohdiabo.net/images/ckeditor/files/92841001224.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139300ed9a58---sosopalazofosajimara.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d1294d121---nonenenuvojibigovu.pdf
    • http://arablift.net/userfiles/file/zapot.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/zonesezanezaxazedojabeme.pdf
    • http://occahomesearch.com/userfiles/files/56817783384.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/giwekowiretotalefifebi.pdf
    • https://ketex.com/trcgp/ckfinder/userfiles/files/96979200442.pdf
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/mifuja.pdf
    • https://ietc-oman.saktoon.com/userfiles/files/25618200769.pdf
    • http://studioindelicato.com/userfiles/files/pamaki.pdf
    • http://yucehukuk.com/resimler/files/50033485492.pdf
    • http://bluecreator.biz/ckfinder/userfiles/files/93101573679.pdf
    • http://fasson.vip/images/editor/files/98648022475.pdf
    • http://guerrazzi.info/userfiles/files/vikajigenab.pdf
    • https://orderpoet.com/ckfinder/userfiles/files/40696752759.pdf
    • https://opsclown.it/ckfinder/userfiles/files/63311261196.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=zooba+android+1
    • 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_off0000e71c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 16792 bytes
font_01_sfnt_off0000ff2e.bin
7f0f3fb558a4e37a16f451c11c42f2ab3a051e66cd372ea419097a49d61fe515		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 17620 bytes
font_02_sfnt_off00012c75.bin
4940543b29eaf6e65cb51ff7943df1e01ac69150458c77259873f60361ab3720		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C75 9952 bytes

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