Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bff3e205b9d2388…

MALICIOUS

PDF

84.1 KB Created: 2021-07-15 19:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9e6195734905ca3a34203af0999f455 SHA-1: 815cd1163d4196390cd90a900ef7b800f17331d8 SHA-256: 7bff3e205b9d2388a9e83f3ca77cdd117ceedf4ebb11d08cee90c77e956d1b43
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish for information. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of malicious intent. No scripts were extracted, but the structure and embedded URLs suggest a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/64ae392800f95f85b353264aeb2e6357/xuvelutisobesato.pdf In PDF document text
    • http://www.aluvascientific.com/UserFiles/file/vetiwe.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/9csrdb2lvk2pu7r16n5hl8j18q/tafufamimudumazako.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759c89b85c5---pikebikizolajimiwosawilek.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/652a1ec8876f20e5600814c64f00a048/kabusejotuxurexe.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/44937137415.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/97237099928.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/valimabajolomuwepija.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/87c674d8036291195d39d2d420e38459/deguwomixogupel.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f7951090---dizafoxoxilibefajox.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/wuxulotejudevajoxetiwutu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607daa42cd746---21601451938.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/f183f2eaebbdb71eb7c8489b41d4c75a/17088254072.pdfIn PDF document text
    • http://iccarrentals.com/files/file/golonamukixudegop.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaaa57b04f---88304502038.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/569901abf1347533472a3872e1a72e2d/riwixuxibexekisilinogos.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/185149006.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e8fc6813b---sujabubazupawonom.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/ninodabolab.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/zodofifejurarap.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e58c46b53a4---domukurawu.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/zokageboxovi.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/tufizutuvuxebomux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=down+periscope+online+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AA 16888 bytes
SHA-256: eca17c9f4d7b252cb80d525c83bfa7f2419ef2babe8fbba06dfbb85909d241b3
font_01_sfnt_off000113c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 10300 bytes
SHA-256: fd22d530cceefa80f623e34e25e11b5ecc7f2dd40c44513e436033bc8630c8e0
font_02_sfnt_off00012b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1