Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc40d35408d0c6d…

MALICIOUS

PDF

75.4 KB Created: 2021-06-26 11:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7fd804c285257a774d3e172c6ccdea4 SHA-1: 170b92e5724d48d99672dbcb50cd8ede29616061 SHA-256: 7fc40d35408d0c6d0b97376298e3674ec5b5b0e9fcffb960bd8e03d4eb9b5c65
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The file's structure and the nature of the embedded URLs suggest it's intended to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/6gr01hi3a8umstv9ep7818f7us/kozigevokurexo.pdf
    • http://www.ipkameralari24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae9205a9d0---pevepuzameforalabokimixiv.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c6b92e60---4251396835.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/c98d377464f192ac982a1949a3ba8ce7/35261348073.pdf
    • http://klubalfa.org/img/userfiles/file/49784276862.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/zavekometeda.pdf
    • http://www.vandiestbrandstoffen.be/uploads/files/18684721298.pdf
    • http://krakow4you.pl/krakow/files/49646373546.pdf
    • http://www.hmcpacking.com/uploads/files/bisev.pdf
    • http://espacioschillout.es/images/admin/file/gisisosuwan.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a94334c90d0---17185929779.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096190e69276---64102051476.pdf
    • http://st-communications.com/ckfinder/userfiles/files/28872222651.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1659e458a5---kufiru.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160775f204fcfb---14757570823.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee67f7fb0e---zidakojidogenonexa.pdf
    • https://m-isc.com/userfiles/file/zebovexek.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833ccfc9ec7---53493018302.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/bec4786387a7db3d223f3281e00717d9/2381338013.pdf
    • http://www.gabrielamaciel.net/images/content/file/83596716560.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d17fbeb9f---mifutemitowajavifi.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a99f654317---giweweso.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+many+pairs+of+legs+do+millipedes+have
    • 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_off0000c52c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC52C 16792 bytes
font_01_sfnt_off0000dd3e.bin
1e2142d989aa045e8d52015704544c4bfb732a56fce1d6abfd9db560cad2db0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 16124 bytes
font_02_sfnt_off000106dc.bin
68f3fc91e62805e259dcb6e2a300a1213b826f4dd5441949154ef2ecdb56baf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 11104 bytes