Malicious PDF — malware analysis report

Static analysis result for SHA-256 01eee904aaa13d35…

MALICIOUS

PDF

74.1 KB Created: 2021-09-04 21:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b2fe296b0f649006d0bf0cda8d3b5813 SHA-1: 87de42e38771ffbcd9eaa30f0e3f65946acb4b10 SHA-256: 01eee904aaa13d356d5e6a3c3ceb73eb3ec42402fb3b921a7ed00b9e62aa99a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fa941527889---lixinedezijimi.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ded9a0b6ae95f3bec2e3a1cb0008c603/22310968903.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa158e6364---40224127600.pdfIn PDF document text
    • https://polytex.de/sites/default/files/78510172381.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210601_060815.pdfIn PDF document text
    • http://e-district.org/userfiles/file/gaxozuginokixikig.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ec62634e8---tepowota.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/78461192265.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/47089575837.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/fa1eb437db31a459cffbcf5f6afabdc0/97940942587.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/xaxexuvovobik.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/70182912596.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bc4e516b2---lexataw.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/67323831160.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/srvpuniq8i6addm71gi63h6aeg/656125220.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/55949506108.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/33753581367.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/1476668698.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/winaxibevizejolesewexanon.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/6848843610.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210812162924.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/79644144276.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/81331197668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=manual+hand+drill+argosPDF 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_off0000be31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE31 17688 bytes
SHA-256: 620cab2e064e6d1a1df7c0b95cde02f014fd671e66b07b228b336900844ba376
font_01_sfnt_off0000ec09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC09 10392 bytes
SHA-256: 3ffa4d73ddc877394067e3bcfda7bc35c51f76453dd0141921bfc74e425fdbaf
font_02_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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