Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee078e95398c22a5…

MALICIOUS

PDF

89.6 KB Created: 2021-06-25 22:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2f93395ec71455a1f4d73a7ed3bda7b SHA-1: 751de4e06e7da660c91a5de8979715247b2c7ffa SHA-256: ee078e95398c22a5c55ae2a3d3fb89afc1f8dd73d73917e4dc7cb6eddea9aeca
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Static analysis revealed that the document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5db9e6b209---65893591555.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a45f0fe3cf5---33239676148.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/korokuwu.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0db8d4d0d6---87730495144.pdf
    • http://abacusnancy.com/userfiles/file/lekezewotuxemowixowotode.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc024e07b2---19139086601.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b1dce8488---64738940595.pdf
    • http://ridendo.cz/files/file/77711223847.pdf
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/miliwapalutukifemovaxi.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174449068f---51491753241.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ede4b50d7---puzekowopi.pdf
    • https://xuantruongtech.com/images/ckeditor/files/73442997249.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab209d79a6---sifokoruvufedaferupef.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ede4c3f2f3cd40d51ed5bbf4c9f39e95/79562814221.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1ed2fa81---domefuwijatilaze.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3253a9067---61301789919.pdf
    • http://liyangah.com/Upload/file/ninobalonupalul.pdf
    • http://ondrejkocar.cz/img/file/34778736009.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608269ff95820---81215462067.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/riwidagoludi.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ba45592cb5c---95656880970.pdf
    • https://auto-rujo.com/images-editor/file/pewiwadita.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080d0e769ddd---sovivirekerasu.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609461e04d583---18612644687.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16086154ba2619---29140693056.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608085e4d4050---rapubafaziromez.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=without+power+synonym
    • 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_off0000fae9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 16792 bytes
font_01_sfnt_off000112fb.bin
d9842c1295fa3cbef9528b52ab7429bf0d27d021f145a007f50fe0af16954183
pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 17660 bytes
font_02_sfnt_off00014119.bin
998e4b91e9e8a8628c07a4aa23ccbb8356bfa53d1a6a0289f3399a03686a01da
pdf-font-stream PDF embedded font (sfnt) at offset 0x14119 10604 bytes