Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceed1e06214551b5…

MALICIOUS

PDF

78.9 KB Created: 2021-09-12 08:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c67ddb3ef4689b515ea47c03fc29985 SHA-1: c6f0930ad1496df59c7f17ad252f69243641ba83 SHA-256: ceed1e06214551b5b24293ac866262c8a3710fc97896ddb686a8bfd6e713bcdd
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=control+center+ios+13+apk+download PDF link annotation
    • http://bangladeshceramicsociety.com/uploads/editor/files/96186118774.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/vajekefavaduxobunuxok.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/wajorebek.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/4aa8a95a5577cdd52e42d43bfc3eaee2/xewupi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/69903412488.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/e76651a5facbff44910cb17a709f87ad/minabudurirusajawapovoz.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/tepavitoj.pdfIn PDF document text
    • http://machin.kr/userData/board/file/79157440394.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/30676943422.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/46754786020.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/puzipozumozamusujexise.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/25889714616.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/nizuvibetomawurepobared.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/70287203205.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210909_6FFAAC820FC8A057.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393e4a0bfe7---79246788996.pdfIn PDF document text
    • http://kaies.cn/upfiles/210905225549782741pykxnt.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/71480360561.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/51104744114.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/its6duku10vjoihbi9un4bmu7a/maliwexuvufekupufal.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/jukufaxikaripalovewikajo.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_off0000c54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54D 21236 bytes
SHA-256: 1e65cdb4e38f8073521cccca46c3ad74ebb3bf5554fae5b654902348f2bbd5b0
font_01_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 10940 bytes
SHA-256: 3f5f61a1b67e8bc3a13dd580e3c4f6ef69b0eb4e63c00778a7fec9796224207a
font_02_sfnt_off0001166e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1