Malicious PDF — malware analysis report

Static analysis result for SHA-256 657756fde928b22f…

MALICIOUS

PDF

91.6 KB Created: 2021-07-27 01:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5ba5ef7196f2c57b240198cfa0459b6 SHA-1: edb4438b36614ccde8b630824114db2efc7fb9e3 SHA-256: 657756fde928b22f1f1ae8d5051d4b10a647d89f0e203f2cfbfdc06e743b5989
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous disposable domains and compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and a link farm structure strongly indicates a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://computerdoki.hu/user/file/gufepuxikejefuvujuva.pdf In PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd006b9be---jadeleletu.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/uved9htbtd0ttmv002ih7nuao8/bodozokudonigiz.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/nemare.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210722_F1F875F80386CD4F.pdfIn PDF document text
    • https://teddybestore.it/file/ruminorovuv.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/8e6cfbf39f13e22c2c639261546cf51e/lumofanovaparamipogeba.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/piwuxurikaz.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3433834be---39547202371.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/594beee0a545ce86481544c9bc09c177/kejudimirilusebozaxovax.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/87727048153.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f775f6d1f8---jafogufi.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/18748209517.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/29020293543.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hcijjit9d0oajc24ecm28e6cg3/92858558148.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/wunenesamezunaleliletiweg.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bfb6e51e110---72744656456.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210625182506.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/1368076690.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/4e006bcda9a84227dd047236473479ef/75188556816.pdfIn PDF document text
    • http://cuiquji.net/d/files/57444080542.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/69723120402.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/ecec9b29487ac98e564c761af7914219/kesadogiwipemefoxoliw.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/noxevikugefuponufomukasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=meal+plan+to+lose+weight+in+2+weeksPDF 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_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 10720 bytes
SHA-256: 957f0d1e8c363ae508db7d752a221a283dba7a6cbbd95a1f8110ec35b5462b24
font_01_sfnt_off00011b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13373 16872 bytes
SHA-256: a81d1ea9c41217ef68447d1de2e7e92f356ee45c9db6c8f3030f9d9c5dddb044