Malicious PDF — malware analysis report

Static analysis result for SHA-256 a512815ea8d6c255…

MALICIOUS

PDF

73.1 KB Created: 2021-06-28 21:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 764e23de17b35e86d150806e95549b30 SHA-1: 7562a8ec46a1642c9ca7c887b3a23e678e397b99 SHA-256: a512815ea8d6c2557a42ccc68b9e6a5d124f4ab2839c206360dccc404e48b4a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to trick users into downloading a malicious file. ClamAV detection and ML classification strongly indicate malicious intent. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c900fe9b150d7dfa52f9ab9fd9348cb4/fusopunisizazubupurunexa.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/17db34ab66723fc45c28ba279b325b09/mibalapotetuko.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/a2785a2159cee157271ee5f67eba8097/pimegifalavoronuruwomoka.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/66d4b4eae4404a75e6b73d4dd173463f/farezebabunalo.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fea33d8db0---pokebafalili.pdf
    • https://pt2-turbo-j3t.com/contents//files/93072046175.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607625287e5bf---95410442567.pdf
    • https://vvpta-irvine.org/userfiles/file/47766418763.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609973b4e20cb---52186085726.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160967d39b9dbb---rumabezigapi.pdf
    • https://kovosluzba-praha.cz/res/file/nugibaduma.pdf
    • http://amuseonline.com/absite/userfiles/file/58197553101.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb6a6349cb---650471715.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/98eaa1a55f70a2779882a4ac460977f0/rofikirajabisidujeguv.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d567bbe4---72570507853.pdf
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/powajefulaminolob.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/asphgi140k4eips777bsutdg99/jevafepidemosavovo.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24db66a5a---18560097874.pdf
    • http://aep-tc.com/cache/fck_files/file/43383192491.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/potopirosak.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/cc85d3aeb2dce723f1de2791f7688bdc/48358056232.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lnlphg1jkrf6kg3gambbrr0fe0/tusibiso.pdf
    • https://ratsimae.eemedia/contents/file/97228074263.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4da43be524---sopekugedu.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc9f33896a---11250024425.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b08bd923e5---lelinox.pdf
    • http://paulsaperstein.com/userfiles/files/fugibiwajabulexuvemetaram.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=biology+benchmark+2020+answers
    • 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_off0000bcfe.bin
2ce12f139329f05569d17eb3647949885905aca8181a21b0f969a5e1e26da869		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFE 11304 bytes
font_01_sfnt_off0000d77c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 16792 bytes
font_02_sfnt_off0000ef8e.bin
654c7e22037f9ba839c0da7437ee4b5fe9f57e189ed535fb1e0902d48346ce00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 15512 bytes

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