Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d03a4cd759b6fee…

MALICIOUS

PDF

89.7 KB Created: 2021-07-18 11:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58bd3127340242fd8613c7978b8b0553 SHA-1: 1a94f9c3b95a0c95a814c309970cd43d7f3c3d04 SHA-256: 2d03a4cd759b6feef998b27a9bd57b1180ed6e00353292d187b2d56c5a630fdd
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, presenting numerous URLs that lead to external content, with several hosted on compromised CMS platforms. The presence of multiple links and the nature of the hosting suggest an attempt to distribute malicious content or phish users.

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://naturallabs.de/userfiles/file/pazapipezibulomit.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0tu6lr67nj8qcobb8hctam7fmr/gizuruvedamamix.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/df83e1530f05d831c0daffea6ffa06b7/49828230028.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bef881a52dc---64469174449.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9de0bc0d9---duxilize.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609490e70a548---joweliloteguvofatarura.pdf
    • http://rialta.ie/userfiles/files/rogujilitagadivur.pdf
    • https://vmwarts.com/ecovic/file/dixagigapugadopojet.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/26799924905.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a3a09ad3---58458326648.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9220bfcaa---gubufuz.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a62a2c21---73824870551.pdf
    • http://microsolder.hu/userfiles/files/78469161184.pdf
    • https://hoavily.com/uploads/files/65125407454.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1kt473tv1iv9a21a7iri6krv34/91662426054.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608803f49066e---wavopovojifagapijilut.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/25ba6f7b43461762fff92d5629b77cc3/75195234383.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e2201015bd9---zujupoli.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608824ea693c0---basegexugoxuvenipulud.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/cdbe6d9a3fabca649040e5be8aab8ab9/kepobudi.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2ee590d2fddca1aae1f480fb227e724d/73406184919.pdf
    • http://planao.com/ckfinder/userfiles/files/77095854149.pdf
    • http://udclassof1968.com/clients/74076/File/5176507367.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/jitijatezuludibivimapuvi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=positivism+in+history
    • 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_off0000fd5d.bin
189523ed4b9be08263bb6b8dd9da0fc21cbb7fcfeb6b6c7d25111b10b65d7b47
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 10212 bytes
font_01_sfnt_off00011414.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11414 16792 bytes
font_02_sfnt_off00012c26.bin
f8d69d9d363aece0dcb1b30be00d505eb51066dc26b6e7c1a2a2b279eef11e23
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C26 18372 bytes