Malicious PDF — malware analysis report

Static analysis result for SHA-256 1876425ef88cf343…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 23:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b87c5ef4fc29ef8900abaa9109431e94 SHA-1: 3fde8d1a13b8f785578134a465620c8c5b87a5fa SHA-256: 1876425ef88cf3434c8b42acd78e4a3f2669cec6f5f531a677c73b1f4036f7fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=hollywood+torrent+magnet PDF link annotation
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161363f622b8c1---61629338525.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/lafeleluw.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210913090708.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/tukeduvepipevowona.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/ruwepomomivavixefimobup.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/25213024537.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109161636284147.pdfIn PDF document text
    • https://adikketiga.com/contents/files/voxotobunos.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/39908733747.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/18717219774.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/66987604535.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/28229790577.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319ed47b79c---13240665893.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/66395185673.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/39508001863.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/95867378857.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/18360287116.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/85296533496.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/murupilepew.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/purowakozewulusotipad.pdfIn PDF document text
    • http://ergakiland.ru/files/files/68729834332.pdfIn PDF document text
    • http://koala-al.com/d/files/82749412947.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/336856650613b51ec3cdb8.pdfIn PDF document text
    • https://j26clean.com/upload/files/resexikuxobi.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/20cd2de6080aa9a16d5e8deeef33e870/36638122194.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_off0000b108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB108 18288 bytes
SHA-256: ce2d31fdb421c5ad2a4b51f5ef4bc1f505e0e61a3825ba5aef9fe2b28bf469be
font_01_sfnt_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 10520 bytes
SHA-256: c21ce3441f5c40beaac084b254319aa72374799b639c86f24977a0df790ad490
font_02_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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