Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b0df945f2bb239…

MALICIOUS

PDF

88.7 KB Created: 2021-07-20 19:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d31639dbb6c5c49a51e0d2109e17524d SHA-1: ddb459e669ee20cba9ae0465cdd1edd0e111f4f9 SHA-256: 80b0df945f2bb2395bb81e5233d70dc513f8c6653610d79b0fc04ba611a19c72
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. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as a lure for phishing or to distribute further malware, aligning with spearphishing attachment and malicious link attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7932

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://strandedtattoo.net/file/konekedakosenozunugakowi.pdf
    • https://groupburuemas2.com/contents//files/fakixevopinijoraxotuwib.pdf
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/rababozatovirokinixub.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/peparidefedenake.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a32547237c0---xanilegafenejotatufomex.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5dfe1494---40214403650.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a527f4ad07---medodumez.pdf
    • https://eurotechcorp.vn/admin/webroot/upload/image/files/lesuziz.pdf
    • http://195exim.com/datas/files/xifazukajelejenenul.pdf
    • https://tavcam.com/upload/ckfinder/files/94356865676.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/53377854076.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b3f3ae7b---90177904791.pdf
    • http://medicapoland.pl/uploaded/file/66528491036.pdf
    • http://nesemlak.com/test/images/uploads/files/wikipuki.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3884d2a67---61214902662.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e59a712d23f---23815819904.pdf
    • https://rabudiagnostic.com/userfiles/files/11385270304.pdf
    • https://amblamy.ee/upload/file/muvofaz.pdf
    • http://portalkucharski.pl/app/webroot/media/files/pipatekeruf.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/c7d8699becb70475fdc9817887a28a1d/kalel.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/f5acbdd25eb576283fb47a41f1294c36/vewevowubofata.pdf
    • https://aokman-drive.com/d/files/rabirefesakepozapesufikew.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb780e2474---30925197627.pdf
    • http://dmhu.eu/uploads/uplib/file/xekenijefaj.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c2d36a30d---33831038922.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b6de7767d16d612884bbd298cfcec48/18119444814.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=blue+tick+copy+and+paste+instagram
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e509.bin
ea8a4e0b629982dea99d8c8e202e61a9b5475497d431e83ea115488be251ca58
pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 11216 bytes
font_01_sfnt_off0000ff2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 16792 bytes
font_02_sfnt_off0001173d.bin
ac777df8558ea7d013baa55281ae77e525bf8231944214dd3f462ef9eb2ac479
pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 16448 bytes
font_03_sfnt_off00012dc7.bin
0d16b1af54f04a2b5a99c16e284bac72a8202d3b3391d38736e9f4838c63ca4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC7 18424 bytes