Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56d3209b3aff15b…

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 20:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcd4869d30b1ea156c316d0ea80f3260 SHA-1: f142520375a7757e3aa00c69e5c41d5472a1280b SHA-256: e56d3209b3aff15bd744374144b1fa2e381dcbd5ff2e4844dd579134c81c4406
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, many hosted on potentially disposable domains, supports this assessment. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e96e7a4b4c9e5be71f7199c249fcd494/tiseguju.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/cq5uuccrmt0ahdetaghhfspv48/21977900077.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75a5b8744---zusafujal.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f770e026e---36768847016.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160be33dddc1d4---kitezixosotebowupazor.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/66d86f0698146284fd374ee821eb1660/gawoluliro.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/il4teff0qvt3jluhfqs93spedv/nukanipeluvuvajarara.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac46afa92---zupafiribajixinosesobowit.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609f00cfe66ec---zaludemuxom.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7cb4271f1---jifexazebubidog.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee51iem3e5pjganld5o39j2lff/10685582804.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/8593311859e2d9fd317f161cb974c5c2/zuvilevupemud.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ed1c0ed98---11670599629.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c5f061de356232b787244d6a70aa428a/94172026276.pdf
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/xalebowezilozu.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/kann9bddjl2ll0ltvieq7gr3et/12813967291.pdf
    • https://peilimineko.com/userfiles/file/25119006214.pdf
    • http://bjaimama.com/data/upload/2021/06/file/202106030117255375.pdf
    • https://chmelo.hu/sites/default/files/file/tanudoxiwezox.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9205bb4281---kagesazor.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8fd0576ad---wibanigoxatevelepupuvelo.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/51177eabc59ea4ef5f4c9512b4b2e8e9/merujinerokawanokesaranax.pdf
    • http://beiwendq.com//data/attachment/file/3626655569.pdf
    • http://mmckno2010.zkosuchdol.info/files/sesumusafugikof.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/eaaf5946634ee0890f4e03ddff9abca0/najosimexewulun.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cover+letter+for+revised+manuscript+submission
    • 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_off0000f054.bin
eb63a379ac794deaa5c896e0cb64f4b979993f7149db3b666f5709de3118858b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 17032 bytes
font_01_sfnt_off00011c32.bin
21d9705365c77161c6e53766d7cf8db38625ec4bfb61d8ac0418ede2747f5ec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C32 11120 bytes
font_02_sfnt_off000135f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135F9 16792 bytes

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