Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d32f6bfa292307c…

MALICIOUS

PDF

100.9 KB Created: 2021-07-24 12:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d4af35647f65bb66cc6daa547fcda76 SHA-1: 086766edfd13248e607b68e27dcb3809dcdc9a75 SHA-256: 1d32f6bfa292307c9397de735085c03dfa58f0dd0f04a2d70d9c9c7268f569e4
176 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URIs pointing to other PDF files hosted on various domains, some of which appear to be compromised WordPress sites or disposable hosting. This pattern suggests an attempt to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/gugijofijuwu.pdf In PDF document text
    • http://beachhigh65.com/clients/879402/File/bigijemakuwe.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/15055672463.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/27946788343.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/tawemilavaxi.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/xeranavisagezalepak.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2171d54ee2---sorudixadugowo.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/3hn529v6vp3batmms5p7kjjmko/palifudanelifezu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a97c66b4838---85465946427.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210704164208.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/nukitazefu.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94feee804---gibesedajanojinagabaz.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/al9hf441nvr850jhce79ih0dct/28981208757.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/rivepubafikodu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab6d38738---57909926550.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/10026795158.pdfPDF link annotation
    • http://edu-family72.ru/content/images/uploads/file/sepidi.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/91990545658.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/18995585694.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/c27gj2vcqes48pk4h836rorrn6/palirojusejonawotujivo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7803171be6491a9703956d3aaf130780/mavakiwopa.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e3c29aa06cf5e677e8d72aafebd76a24/bafiwesosapi.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/22370184546.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c070e047d02---fosuvudumudoxu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3db7f2b8a---nabifuzejasomefososorex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=papa%27s+burgeria+unblocked+games+66PDF 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_off0001217c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217C 11292 bytes
SHA-256: 8d8bb36e9cb05530c47d882634dea2e4a0a9d79f23e4b7a45884df17889a3394
font_01_sfnt_off00013b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A5 19204 bytes
SHA-256: f841ed229baab6a2a5f1a41acd0f7d1a9d5b984de37b845fef2c5b13c6d5a88a