Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc28c89e935bac6…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 10:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 279c69f2c2f9ed4fffbb675778c6fbe5 SHA-1: 87e1795857c6e42bbc2e5fb9d613b4f03d78a432 SHA-256: 5bc28c89e935bac66bc477c3ad16d3647a1bf1dfd9b3818cad15f44ea09186d1
96 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and disposable domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. While no scripts were extracted, the nature of the embedded links and the ML classification strongly suggest a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=sky+streaker+mod+apk PDF link annotation
    • https://aradmissions.com/ci/userfiles/files/ratolumeferesiruwu.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/jevudos.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/65919913247.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/lifuzijizupapa.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c07f09b4fb---36765581405.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/9921902146.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/52206818017.pdfIn PDF document text
    • https://angkagenap.com/contents/files/94734313399.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4bc4ff77e487344f26a1e24eef0df74f/25496112022.pdfIn PDF document text
    • https://anfauglir.com/images/file/vukupiwojebanofuxoji.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/46108559664.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/vonumuwizadasejiwifotede.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/fabul.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/masagimivapinujodap.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/domunikutifileka.pdfIn PDF document text
    • https://totounited.com/contents/files/wivafelapa.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ccsoisbqm4ru8lsglrd4de7cd6/93704845049.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/61499502807.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c34068f5b5e515bd9f80b26b3dfe49c6/8284435707.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/sekirepodabusab.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/bubipiputirejovuxilew.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/58876358504.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/lotonogamofapafi.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/05t24ej9k8hguucdv1ov5uf315/94247545380.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161323abcc3742---mazetusopenulokidu.pdfIn PDF document text
    • 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_off0000c13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13F 10592 bytes
SHA-256: e78b3c6df78187a8551f7f1d1cc90eaae9574a5164b32ba887cd1dab352b4f9b
font_01_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 17244 bytes
SHA-256: b27d436957b9e286e79d31c35e2adf1c9c7a57669d3bd57ecc6e81816ed07ff8

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