Malicious PDF — malware analysis report

Static analysis result for SHA-256 26dfe5fa3efa50db…

MALICIOUS

PDF

88.9 KB Created: 2021-07-02 10:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d401bdd1eedf1722542e7aac949a090d SHA-1: d69529dcaeebb3a6f378ad4a32a45975105f315b SHA-256: 26dfe5fa3efa50db3328c23e0e9d76d3a9460920491e0fb1de6bd78fd29bda87
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to these compromised sites. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common phishing and malware distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609499ed41edd---24428113676.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/9c89e19382104f2a085b1062051009cc/61213661436.pdf
    • https://proxus.nl/file/niwumokow.pdf
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/sozajokivenamimeditixakeb.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0qpo26dk1kpq3ivhgtb5gqun05/kadarides.pdf
    • http://homenet-spb.ru/userfiles/file/galiwoveditilu.pdf
    • http://abwlanham.com/uploads/files/92328723350.pdf
    • http://gld-lining.com/user_img/files/23051599468.pdf
    • https://unosms.us/userfiles/file/83642612258.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609637bd2fd2f---kesijewop.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b307ba7e77d---bikidigubitagapubemus.pdf
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/dirotopepojujugidune.pdf
    • http://ownlines.com/upfiles/file/9370261518.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e2ee962f7d22facb33174eca59e7c0d3/bonebezonitufikasoze.pdf
    • https://adtw1.com/ckfinder/userfiles/files/ruvupivefupifekejilupivim.pdf
    • http://alliance-ic.ru/uploads/file/13010750179.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa88a5b42---65041447066.pdf
    • https://coastalstudio.com/images/main/file/60823608381.pdf
    • http://splogservice.ru/content/file/78211691997.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e193d6fa374054cabc44a4137b8d24bc/sulepodimine.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d563dc1079a192b84ca191472c44306d/gorijanexigifo.pdf
    • https://asset-books.com/userfiles/file/96800339793.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083f0e93b383---48829178187.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbd67df7cd---20998281650.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/33755757886.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=subroutine+in+8085+microprocessor
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e021.bin
8fe27fc59b8abd62277a97fd0a49e99fdf1fec69f3edbdffd0e49d494b8ea2e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 11108 bytes
font_01_sfnt_off0000f9d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 16792 bytes
font_02_sfnt_off000111e9.bin
6ee66fa1ee8f2b277a3fc8aa1a5c3e0feca17b6fa2bea47511516390b993cdb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 16964 bytes
font_03_sfnt_off00013e48.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E48 16252 bytes