Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76773a456d48b97…

MALICIOUS

PDF

86.3 KB Created: 2021-06-26 19:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec26cb0c79b0b5a5903c0c3bafb6c90d SHA-1: e17639e595003f313357c59c28c2ece0227e9fc6 SHA-256: b76773a456d48b9776deaf11b8ce9a6e77ad954ca8a73ade9fe1e3931215387a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware delivery attempt. Numerous URLs point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with techniques used to exploit vulnerabilities or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://cructi.ru/uplcv?utm_term=first+impressions+hair+salon
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908607f2b11---17255739414.pdf
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/d8754a16f292f05c9d4f82c78a28443b/senopixupevufivubo.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/101eff09314abeeb87b4d59ad69ec97a/20739650663.pdf
    • http://triptoboloyfoundation.org/editorsfiles/files/67457056220.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/991eb8d20b04cbe971d09ec53a1363dd/famejoxuso.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf01a7b9f---jusisoxa.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a05d6863ad---15407315113.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b7333cedf7d---92398928253.pdf
    • http://oio.cn/uploadfiles/files/tunipobipoluruwurigowe.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ec679a08---39560322408.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/ac981894a2540c8f139e9dea4e325bb6/jomevikajasada.pdf
    • http://turagent007.ru/userfiles/file/1816477668.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5e34063489ba5803e15e78bfb1eaa5aa/26744810349.pdf
    • http://skupka54.ru/upload/m/3380178236.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854ecbb28d0---12203432860.pdf
    • http://armanetti.com/images/83013787528.pdf
    • https://aimhc.com/userfiles/file/8434831899.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6734b989---55356224197.pdf
    • http://inlovehuahin.com/file_media/file_image/file/nonivafokexij.pdf
    • https://bucatariizidite.ro/printuri-fi/files/56910506275.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/7d2f160961d8fe83833f5fc538e1cac7/40506656210.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/6b45662c5a0299ccc6e1019390a83951/toguperupagurezov.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b80d003f496---zidaluw.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072519019620---liduduvikegibolij.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_off0000ef74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 16792 bytes
font_01_sfnt_off00010786.bin
404e1a3c7bc85686ca23ec1105fb5ff2bb26c268a07cefc7dc9b0ee536bc9c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 17132 bytes
font_02_sfnt_off0001343d.bin
cdbf0a967f3696ac94c05536d068a4aef82cf11e5e764957bf5d7bc6ea711b36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1343D 10492 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.