Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3f360a02c4c8b7…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 17:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61f684b0c88c13c02764aba0a84d4511 SHA-1: 17964e716df3ddfcf497a7611f64d37ccc67bbce SHA-256: 7c3f360a02c4c8b7e68865c8bd550ca9675043d7ba1872431e9ebae4501ae299
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vmkmsz.hu/userfiles/file/silojirizoxeluromipetoda.pdf In PDF document text
    • http://timeyear-v.com/userfiles/file/kepalimupa.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/40445342840.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/41951068219.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109012102417315.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/3805699912.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/99192355138.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/vetamimovolarilax.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/11871423549.pdfIn PDF document text
    • http://stylekd.ru/files/16986691812.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/wozojofixele.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065219d097---52014995352.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/42692211108.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/32730973309.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161314431b45cc---zonanurodutamipup.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614191cba6dc6---23457677484.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/13814929666.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/84642878638.pdfIn PDF document text
    • https://blogsma.com/files/9988098001.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/xibosipanogonimekutenukil.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/46758983272.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614473663c329---98584034706.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/36807751914.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/682931529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=watch+the+day+after+tomorrow+online+free+123PDF 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_off0000cfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 17472 bytes
SHA-256: 76f839a159b1282bdd69bc411755500a0b4935c5efea4616fe1065af24cd2398
font_02_sfnt_off0001159d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159D 11108 bytes
SHA-256: 3c775c6fba5e6a97adf9feb0c6e8283a8ea2b3dcbd57d377e638b732fef950bc

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