Malicious PDF — malware analysis report

Static analysis result for SHA-256 9763fd9e8ed865ce…

MALICIOUS

PDF

83.6 KB Created: 2021-07-10 05:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6f833607d7b9284fd25f40c9aba8a42 SHA-1: 1b480f3096c0dbd8cafd783f89f109c5d2897b2a SHA-256: 9763fd9e8ed865ce0b5c1d73b535a264c60e3167ced3ea66f467e07d21ff2aca
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm used to distribute malicious content. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly suggests the document's content is designed to trick users into paying fees for non-existent prizes or parcels. The embedded JavaScript likely serves to further exploit the user or redirect them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://davidhammerstein.org/userfiles/file/refelegumelilu.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/0d6a2036e399a508315a65848d9e8964/sikijopanovelukuva.pdf
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/23165330808.pdf
    • http://jatyn.cn/upfiles/202105/file/1622345926.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c565a8e9f2c---52958971441.pdf
    • http://kpdb.org/userfiles/files/vutanulejifugokevavuton.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/617d1be766c0907d06dae33dd1ea28af/kokeludakepun.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/0fogctsj46kv66dp1bn0slmr3q/77612915667.pdf
    • http://posekatzahradu.cz/files/file/bopisefadopos.pdf
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/novexazikifej.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb1b015b4c---64231310666.pdf
    • http://e-sportis.com/images/upload/fakep.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b1fe0820d8e4b576e95e93314e90348c/jufajiditotivoxetutabuti.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0625/cdda94813160e9a52da8d0bc5af199d6.pdf
    • http://munnarinfo.in/userfiles/file/ralevaterokobowev.pdf
    • https://camelcarpet.org/d/files/44975808960.pdf
    • https://an-professional.ru/img/files/file/jujofotalo.pdf
    • http://tvtamminhphat.com/uploads/userfiles/file/xuzujijorefuja.pdf
    • http://plusk-car.com/js/upload/files/37256293021.pdf
    • https://eingangrad.ch/userfiles/files/bejogexoveralizaxuzulepir.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/309c50868e5f9c7a76b971e802d4c519/pojixepozusezaxo.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/52f2go9hob48p8ilcjcvv9rhr5/39903312637.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/63217238643.pdf
    • http://sosnovgeo.ru/userfiles/file/61355571989.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+skilled+worker
    • 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_off0000e3b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 16792 bytes
font_01_sfnt_off0000fbd0.bin
c8fe23b7e6a80e1cc051e593cc1560af4397c9b7535557f8a1b9097e9b4b3367
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 10412 bytes
font_02_sfnt_off0001138b.bin
0785ae453afd53aec1a8e76e31445ef7793534bdcffa897770b08975292e8762
pdf-font-stream PDF embedded font (sfnt) at offset 0x1138B 17664 bytes