Malicious PDF — malware analysis report

Static analysis result for SHA-256 8152d05f0361f31b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 10:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 590ecddc67305d2cf5157831a5f59bf6 SHA-1: 71456e8cd07477cf344af2ea28ccb2303cd2e6fd SHA-256: 8152d05f0361f31bde7ca4210b7a1531a0d3920a17b19c3516841fc699bc3495
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute phishing or malware payloads. The presence of external URI links and the 'link farm' heuristics strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=conversion+jpg+pdf+en+ligne PDF link annotation
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160f735b4e9e3e---zevegune.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/517e8e6c2f26b44b05f2a683bd9dd74a/86531228369.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72102728c1---27299099767.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/41736479131.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/lubododana.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/filunalinadaragupa.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa136c07423---tuwip.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d53ef2fad7---koripukoresiwedatubini.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/d2237cd9b373e231ae55c02287a3150d/17259070119.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/17384642111.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/wefajafana.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/vaputezudebijajamukatolat.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099ec0eefa8e---95535239836.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/logatiwatokamogojazorogu.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/00278fcfac5b15f023d10c2c2bc6a845/jojasesapinelil.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/48314452978.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa20b40f629---jisanorapalewavudowewiz.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7031759b6---75897675269.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/p1sr40i16kpdnk9f77aikd46gk/43235494893.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/15781659622.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/nofiv.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/84461355044.pdfIn PDF document text
    • https://jin-ji.com/upload/files/68595070492.pdfIn PDF document text
    • http://demkapi.com/resimler/files/26003152827.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_off0000d2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 10640 bytes
SHA-256: b593d604bf6df1726fbe83054cce1c2cef1dd79764c2fc097f1754dc86ee7a9c
font_02_sfnt_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 17200 bytes
SHA-256: cf418b26976b289356b2fee1add59cd07bb2d617ef9e8ee87eb72f9316c46edc

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