Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aea883b2ff85e12…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 12:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a3e771ed9449dceb1e930f0473ba453a SHA-1: 1fd7ebbb30e2838831fce4ae2d1f7bc7ef0369a5 SHA-256: 1aea883b2ff85e12cb324e1b75e7c84f7ba2c1748f557974524316e2ec4264cf
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to download files disguised as popular software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=pokemon+heart+gold+zip+file+download PDF link annotation
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354173718e2---68696490912.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613838d964f89---83309452853.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/78159304738.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/muzilebonadalijiz.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/a3d7e0295e2a3f65c392f588125878fc/nikeditirekivepuwub.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/28615554820.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/84441668877.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/k3l7j1fhj4oj8mpv3mjv6gosf4/38495319089.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/91205835631.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/36023501071.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/60364459883.pdfIn PDF document text
    • http://ymmicro.com/files/files/danedufimolapubisejuxepob.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/pesatazenugexum.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/7b43a81556bbdb97df9ace7b6f4b3fab/41793261607.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090300521573499.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd6253827b---jekaxuxemosekunegekotuso.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/15573812553.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/duvor.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/totetarekenenanawaxasul.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/deparesotowapixiperopav.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/xuxowikisaturofa.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/44041233450.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/92662204743.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_off0000d0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D4 11016 bytes
SHA-256: f4684465e2cf800fce572b86f091fb53067760d14938754e1c6c5d9059ba83df
font_01_sfnt_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 18144 bytes
SHA-256: 764d0e987b06852df94f0ac0e5ee8b86e4552e0f97b84060152feab86fd044eb