Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e0387621f0f770…

MALICIOUS

PDF

90.1 KB Created: 2021-06-26 09:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea2f1f84e3baa388659ace1d87bfb23e SHA-1: 52f4827f5fa46308905283be755bb5967574f36b SHA-256: 57e0387621f0f77003fee55981e838c497a6c7ad84af9f53837e5579611b3935
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to compromised CMS upload directories or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=indesign+brand+guidelines+template+free
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/67181228027.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7aeb31ff0---pinusolu.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7kb9u2950v8sdq49n7iknjvrk0/45250235791.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qig0odtccklja3bujf8rlimq56/54467077758.pdf
    • http://allprintusa.com/admin/images/file/bomiketokovuwerane.pdf
    • http://jtour.vn/userfiles/file/58190479420.pdf
    • http://a-kamen.com/userfiles/file/56897010267.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c97954befbc---15112747394.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e504b47ede---91489795731.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/8160319393af779b62eb0b1a348aff65/wokiwosamipo.pdf
    • http://polletnv.be/uploads/files/39669899411.pdf
    • https://torgradio.ru/new/files/file/fetetexisiromegaz.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cd85af2b955178b4241eaa718729e95c/doguperaxejosun.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tocpqmk8dhpq3a83sdh6ap19dn/puxajodoru.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16099da7068943---zoxozokofosirivewo.pdf
    • http://gorisum.net/fckeditor/upload_file/file/80313664379.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/ef17bde7505f313ee5e0013b4d38fa65/24881599733.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d30109ab72ff90e4d32f5969b1edeca2/55786465178.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba4436b7e1---32262707678.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/38f4554d133bb15537a288bcf1bd3d92/13491823180.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/lodt2nvj0htaosjqmfbid0f2sp/18037086845.pdf
    • http://wccflooring.com/userfiles/files/86016002778.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720ad754a2f---73293309834.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106251844015293.pdf
    • 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_off0000faa1.bin
05170b578ecfa8ab40c11ecacedd67b9e93a035af973694e95a44995d2e1b072
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 17428 bytes
font_01_sfnt_off0001284a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1284A 16792 bytes
font_02_sfnt_off00014061.bin
a92370b10bd750d60e454a7b7a6904e740566776ef8d045370bd965384bfeeb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x14061 10912 bytes