Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ffb4309a8a7879…

MALICIOUS

PDF

86.2 KB Created: 2021-08-15 23:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d93a297ebae7812756ec8f62a84422d2 SHA-1: be63270e9767d5ec89efd76873d6c8e2b673f724 SHA-256: 54ffb4309a8a78791180679452277f171a40c074c3003628d89534a1e54fdb03
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be facilitating phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cructi.ru/uplcv?utm_term=geometria+analitica+como+se+calcula+la+distancia+entre+dos+puntos PDF link annotation
    • http://maiodi.com/userfiles/files/67648318239.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/dawuzetabeluw.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/n2l4c1g7f33bhfe1cragkneae4/81184374799.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rvbn2g41hbpom31ghk4r6829p4/zasolupemelipotasamu.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/0f692ea86e25996625f5a87d7d59ee56/suxagogelubapoletatijo.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/femekalujoruxokubis.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/dufazofatudowovasaro.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/93056506335.pdfIn PDF document text
    • http://demkapi.com/resimler/files/lofotomubonemo.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed45672df14c198137fd26617b5d813e/xatolefafafux.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/25641092539.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609a57debb710---83844650071.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/pesileposibuzetazukajuger.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/zakinipu.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea611920d---kenafometewud.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ead4d871a---33306478536.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/78767923422.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/kl6lmdpkaebvces69tcevftvf0/nojikimonepuxawonewinofuw.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3b0bc9135efcd8f813c330b8db4ddf1a/kemevukixaniteditu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/2j1mj542gi622gptjvm8slb19h/85475436207.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/zovafapakidobatumaxamuzen.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bbee69187ef---wefuvumuno.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 18560 bytes
SHA-256: 7a2349e0cefd1a43d92a50f2a80ba8b582f5465d266cc3e7e62523cad47094e7
font_01_sfnt_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5E 10812 bytes
SHA-256: f43d5fa0bdb0b7c7b0bb15c3a5fd7ef9a1c2c491a2610dd7dbf69c2552c23757

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