Malicious PDF — malware analysis report

Static analysis result for SHA-256 519dd0d6a4a1b07a…

MALICIOUS

PDF

102.9 KB Created: 2021-08-26 14:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8c4e6d0e085a968693b50a1160b47cb SHA-1: 11c8e7cc07eef95e47b5faed32674844e0960b1e SHA-256: 519dd0d6a4a1b07a5732f900a942e1c2a510a639b46de0de8c6e8c2d109b3f20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.x454.com/wp-content/plugins/super-forms/uploads/php/files/fvr3gd0ld3c2g012a7575pake7/tuxemivanu.pdf
    • http://ellenia3.eu/userfiles/files/nitunenimixizelu.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810fb4d5eba---fuvokipedosetifibak.pdf
    • http://rasmesafar.net/basefile/basefiles/43684565204.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8f3692e89e821cdf224e4e327a902b1b/zudilafujofatukaberiba.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0a9ce131c---53087565672.pdf
    • https://mygoaltv.com/ipp/images/uploads/files/97423027647.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/ronozaxoxuxosogesot.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29b14b7e8e---samoravijet.pdf
    • http://hanasushipickup.com/uploads/files/pafar.pdf
    • https://bajrahrs.com/userfiles/file/wovelutaronimodut.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/30fb871c52458aacf18b8e827f468cf4/tofuserosizurabala.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084c22273ceb---sewonewu.pdf
    • https://sanruouvang.net/images/uploaded/file/44342229853.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236fb851158---ligaxatat.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/80637695029.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d096327764a---47228768364.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e8ef5797d---42713202670.pdf
    • http://czytamzezrozumieniem.pl/userfiles/file/lejevuro.pdf
    • https://qpshouse.com/upload/image/file/69113384889.pdf
    • https://implantsdentairesdesmoulins.com/upload/editor/file/39207426966.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a16dd2b030---46464104005.pdf
    • https://kermanrooz.com/img/files/4034927037.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c87634bdb2---kulapogulapekodaso.pdf
    • http://dienvietbac.com/uploads/files/56331957710.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=barrel+to+roll
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00016c34.bin
d9536d663ccecbe62003f54334dc0df9825c0d1cdb270ef67e79c793df8615da
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16C34 18428 bytes
font_00_sfnt_off0000e637.bin
e4807a357467c2b0a1211428f48546c48aaf8d6685fff8bef07a1addd7197a1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 31772 bytes
font_01_sfnt_off00012f4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4C 16792 bytes
font_02_sfnt_off00014759.bin
5accd28b93f88256231765d54412dfb73b7c8b89e0db92651776be48329af4d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x14759 4040 bytes
font_03_sfnt_off000156a1.bin
4ab6b093902e45051e87a8bec394501fb351cf9242576a1d2a68719c4d880c36
pdf-font-stream PDF embedded font (sfnt) at offset 0x156A1 9788 bytes