Malicious PDF — malware analysis report

Static analysis result for SHA-256 2063cabc64375c91…

MALICIOUS

PDF

91.0 KB Created: 2021-06-26 12:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5795c47c1717b04dbbfaa9afa4648fd1 SHA-1: cb0a157149b70cf401282e45d9365f6168b7fee4 SHA-256: 2063cabc64375c91a5dbe010434f4c8be385fb1599f57023dcc4db331d7ede34
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external URIs and is identified as a link farm, likely intended for SEO manipulation or to host malicious content. The ML classifier strongly indicates maliciousness, and the presence of multiple links to compromised CMS upload directories further supports this. No scripts were extracted, but the document's structure and numerous URLs point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=bass+guitar+scales+pdf+free+download
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/do1gjia681nf5mqbdd39ur1e31/vazudogixex.pdf
    • http://amuseonline.com/absite/userfiles/file/kesibetituxa.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/d5s0uhdb2mdv9f9shlnnldhknt/19024982552.pdf
    • http://alexlunacoach.com/img/editor/file/88711492307.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e9b8be4c230dd0fad3b0dc701ca0454b/2131296850.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e52594627---91443826723.pdf
    • http://maszyny.pl/userfiles/file/domixitanirobu.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/0de24bc5a28aa5928862bfad5732313b/jofebenonefosaxixix.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160889afdc3e3b---lonorekopujo.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9183d9c100b078f69e203796967193e6/22597549077.pdf
    • http://servmed.net/userfiles/file/57134487311.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16070d60d26b4a---bijonetujaza.pdf
    • https://maxflowfans.com/userfiles/file/reger.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a176aec71c7---64324494828.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/395186ad7806d85671b2015d4b10564e/82797919530.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f00c0c2b89---gotilikujidofajenix.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160997b7289a1e---barelomiga.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/eadcd658963911bec167dc8ced5c3354/87164380614.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81414c25a0---21935973186.pdf
    • https://istanajpdua.com/contents//files/kugijobofufama.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081559d65e3f---28966365209.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/164bbfcb8f07265b6beade8a9297700d/jiridagagog.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/25deb3f08fd8f47b8b33396b1901eb0f/mevidolofizabirinizas.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210525195215.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_off0000fe94.bin
f37ed812e15cdb1deea57250a7cc86e1c5677beb1d90c8eea104f799f4f66447
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 11032 bytes
font_01_sfnt_off00011842.bin
5532d915f5a0b18812622f124deec06a04c166370f20052d574a47c71093e4fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 17808 bytes
font_02_sfnt_off0001463f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1463F 16792 bytes