Malicious PDF — malware analysis report

Static analysis result for SHA-256 380a7baba553028e…

MALICIOUS

PDF

93.7 KB Created: 2021-08-02 08:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14dddbc4e9ec3b441ae5af335e24bb37 SHA-1: 1c7fe9faf0ba2d2b53c51be22c315d9f807e82ab SHA-256: 380a7baba553028e0f1fe0bb9620dffb04d8f331a91df1fa526849c1ab073fd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload directories. These links likely serve as a lure to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9506b2a9a---47783821919.pdf In PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c1597e63011670b72e853206ae641834/xasevenelubemadogomedotim.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/944905fc076e9ddf634dfbcaa182b36d/11851755254.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/c59055ecb3f66bf17d270b74eb965bdf/muvexe.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb27ae73df---37179584609.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/57205605092.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mhp47m1b5cq9dar0prh2mf2n29/sewira.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d83a9364aaa---fajukakimozesijisuxew.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba8f9edd2a---99569796112.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/91852209127.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4887afba3179bd98472d6641322f640e/gobekipuwugig.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210714_071627.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/gedolojali.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0185e2d20---duxumafu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b012fd9c0b9---wevugoduvikukifobiz.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/66285234495.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/93afb8b8e704f2e07b6f39a3e2bbdce1/dipananamifemobinuzufe.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5a78754ba---59312680097.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/48809069390.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/xitoranukef.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/kojuwanopularafaxuzoda.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/94587570022.pdfIn PDF document text
    • http://3sdent.com/upload/files/71975616873.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34a7137a84---84614128321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=can+you+be+a+millionaire+in+one+yearPDF 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_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 10388 bytes
SHA-256: 18e346bb5615a241148b1be6748672d2e197ad7d8b74a878795a9f6db4c49797
font_01_sfnt_off0001209f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B1 17568 bytes
SHA-256: ef20a7ff1e25ddb6eede18692a5f20d2c9180175ccf2a9debfc385ac8c87b475