Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f14c8bc19b613d3…

MALICIOUS

PDF

133.1 KB Created: 2021-08-09 03:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 813b894e9a36b812bbd16d795fcde797 SHA-1: 4724ef2890ded2755b359d5a9e6f70cd29993329 SHA-256: 7f14c8bc19b613d3719d6495c5ea703f999aa34721ee6369de893f20183e9fbc
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the structure and embedded links suggest it's a lure to exploit vulnerabilities or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 5

  • 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://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/tepowezaviladeligid.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d785c186155---74911300612.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/digatisarojotunina.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/ralorisarafilaw.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0439a48877---66871380759.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8a4b7651b---92700361408.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/blnr4jkr38l31hkm38ksc3s5s3/dezujenikumi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c3aa6e565abc1118bb050a310bc7fa41/88285487306.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/10eacf7596a59839b2707b04d33d7560/97998188632.pdfIn PDF document text
    • https://paperland.bg/uploads/file/suliluvekofakirez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ce9a3d09b---bugizilulitasari.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7f287a8d287940b81f0f6cdfaea9a0f6/5956126453.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/xurazi.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/9fec0r67sng0qdso8ec8mmvpc4/gemozarasutolemema.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/70280786322.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a03c62e3925---89150357610.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/61626913785.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/46310615799.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7afca7d0054b7013a3e5b846a11a8853/palerajarikoliriku.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2ece21d5b---69441238585.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d09253586be---40609435973.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf237727eb---lubuwanexenivan.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/lisebagafilijezenobodugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=paper+io+2+hack+2019+private+serverPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00019bd7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19BD7 29196 bytes
SHA-256: dde06a764de7848bfc96c00a58638e1e0f39360960fe50bb98b10365b8c2ae46
font_00_sfnt_off000143c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD6 26244 bytes
SHA-256: cc10400f9028da720376293db576a6fa0221cc9cfc020cb6a8727c7a6bb6f138
font_03_sfnt_off0001cde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDE3 10940 bytes
SHA-256: 7c358da1bd7b1bd40500863a6a958836ce9042621cecfe7041b57d8f619df748
font_04_sfnt_off0001e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E783 8728 bytes
SHA-256: f0bbbae8a94e35104fedf91f2ecae4140b38cfc558e32f672f9e56cf470e3d98

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