Malicious PDF — malware analysis report

Static analysis result for SHA-256 15408b5a5ff18cba…

MALICIOUS

PDF

104.2 KB Created: 2021-07-05 19:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2036407e5ea81583e6c0963d3273d235 SHA-1: 757c9161b9c76db698b87acdac541540316016f7 SHA-256: 15408b5a5ff18cba7aea06b652a7a8b6671126f70dcc8275fbfc83851cf97a8e
156 Risk Score

Malware Insights

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

This 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 numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the overall detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://krisoc.ru/uplcv?utm_term=ur+of+the+chaldeans+today
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d7ee2e45f---64378653990.pdf
    • http://pusancard.com/userData/board/file/54008515940.pdf
    • http://akinmedikal.com/uploads/file/sigixadoxavugifuser.pdf
    • https://wildarium.com/ckfinder/userfiles/files/morubagaluxudu.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cda9695ad---sikujonixulunupokawedop.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2e4c6ebb45d65551783f853bc8cec524/wukolonijifiwep.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8fceaf71471e11f67ac630ccd32722ee/safud.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/68e8da199b1423bed9adcbb7e72efbfe/pamiw.pdf
    • https://alakharia.com/public_html/userfiles/file/77978213347.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf956b4982---jajatupega.pdf
    • http://villa-carlshorst.de/sites/default/files/file/18466244548.pdf
    • https://agentcctv.com/userfiles/file/nomimifosevixubux.pdf
    • http://anaminfo.com/attachfile/file/1079713287.pdf
    • http://tpdw.pl/userfiles/file/95660610591.pdf
    • http://chiesamadremarsala.eu/userfiles/files/ladevejudupix.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/69vhu092pjr62q83k690lcm4ac/35921246134.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/k0qltkmpvm7nnuckjb6nehiicv/jonikuzufupijiz.pdf
    • http://gld-lining.com/user_img/files/32305828303.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d87653c4e8---57219892590.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3dc12407f---rojefibebuf.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cab5a530a66dc956217ed8e03237f4f/difogufew.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/vaxunasekujixopafam.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae93c05073---5326558193.pdf
    • https://esprimagroup.com/userfiles/file/vonatuvokokexekavuxewu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117f8.bin
f2990ac7a4be8bb279b751144e0b6379ef7e248a100387d57d4314440f594107
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 19748 bytes
font_01_sfnt_off00014a00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A00 16792 bytes
font_02_sfnt_off00016217.bin
27391e165ab6786e5fc0bf37ed6f439c5b3f744dcd9206d753457e678dc489e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x16217 10604 bytes
font_03_sfnt_off00017a4c.bin
d1aab35a99957a5ee4d75ebe56c5b40b4e023cb10369d4507bdce1f8a9438e45
pdf-font-stream PDF embedded font (sfnt) at offset 0x17A4C 17040 bytes