Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66dda05b2201637…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 12:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e8aa2a145f54a75caf49b6ed7e942fc SHA-1: 862feb5bd590172f8ab2682d6cb4c764d4f9277f SHA-256: e66dda05b2201637d22f5f05611ae2c039361007861aab11afe5b168165ed465
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alakharia.com/public_html/userfiles/file/65699822016.pdf In PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/50119763725.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/80281119588.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/pilixipev.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/kubawoji.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/netexesusazodifazepuki.pdfIn PDF document text
    • http://adice-area.com/pictures/files/rufonaxoxebowoni.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/55486949033.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/parusogabe.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/98415880661.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ef0739321---3749510749.pdfIn PDF document text
    • http://hanleyresources.com/images/veguladabasi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136a856410ff---93113991088.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/40468084668.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354c0822bd4---58462390231.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/japaparuketederulokutize.pdfIn PDF document text
    • http://viorina-deko.com/images/file/73636273866.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/kiruwopimebikadigukizok.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/92311511547.pdfIn PDF document text
    • http://ttc-investco.com/img/files/tixozowijezew.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/mawonutamudexogu.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/7742739714.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/94920026726.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/31286975530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tekken+mobile+play+storePDF 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_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 10720 bytes
SHA-256: 20332d42d91c413c1507b97b42eedce153cb36cd033044ded3791857f9efa238
font_02_sfnt_off00010c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1C 17796 bytes
SHA-256: aab94abbc6a9610b9fe2559f37783c15b490eba93b2dc8d51e8c108f700ea3c6