Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a4c32db99a10ab…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 12:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6311a7cdf7467f71c1fd612d6dc7590 SHA-1: 91b90be9d00c6c45df0f94c10c3342af47eae9e2 SHA-256: 55a4c32db99a10ab0f43f77d0993595de0f44792e9d3e1d37dea843b1da5685f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution 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 http://mtecommerce.it/public/news/file/95120266660.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cc3a8ce7c---jutesufugumofuwuwaf.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a32cc64fbd4---betelofedixikan.pdf
    • http://doo-san.com/userfiles/file/20210529070448.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9558802a5f6dd8a0444105c88865bca6/51192004738.pdf
    • http://heyumpnd.com/userfiles/file///95404144934.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/781cq1r864krcbqrlcc4kv65ph/73064226682.pdf
    • http://zh-huaxun.com/uploadfiles/files/banafa.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d97f0e0ddc5---56232795417.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/2a0fe443607d6641dc23978a050c7b5e/12175136351.pdf
    • http://paroissedementon.fr/upload/files/52314185599.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f02c326c9afe43b473f1bc5e78a7a087/45200717206.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede07432a0---sedojata.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c4fc0bc1b---31232675082.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160800d7cf1b1f---42877701681.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/59101789239.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8477c1e6c9---wesinosi.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d0db837a---89981507753.pdf
    • https://alianzatours.com/imagenes/file/gatudikal.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b580022c338---tiwupibijiri.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/xudugowodeniwovo.pdf
    • https://mmszke.hu/files/file/6071012226.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/eb34f9deb65fa3a364532c36ef818f66/33220226917.pdf
    • http://grandinhr.eu/images/user/file/22106109498.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=design+of+axially+loaded+compression+members
    • 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_off0000ed38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 16792 bytes
font_01_sfnt_off0001054f.bin
da51657f1358732d8d8dbccab0fbed977ef63e4fecccaec9f4a9dea8aba5c206
pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 11224 bytes
font_02_sfnt_off00011f2c.bin
c800f373d0d43a28d97671c9d2b49cf8c0f4aac601e3e71b581d89bc08131601
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2C 17104 bytes