Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc565fdf208ed1e4…

MALICIOUS

PDF

86.6 KB Created: 2021-05-13 22:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fcf0948d2de503df8fc14e06d578b9a8 SHA-1: 1d4136e03f8105e6e5477bc08ea66225e1d7be4e SHA-256: dc565fdf208ed1e4798b9e637e330363d8880f70012941b5f0c137a55465c359
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of multiple compromised upload links suggests a tactic to host malicious files on seemingly legitimate but compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888f4dd2ea7---faxapox.pdf In PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4d57f658cb952bdd3b7c0a070f4df3b7/nepuvo.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/9v56acrljtcrktebif2o5nhcn8/21689221693.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9fd1603ea0f03e6583868e2a968c8688/bizovusisumumuwomuwutogul.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c7d9c23919f3a371207ad2ae5b3f262e/sabow.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/23921787905.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e147d57a2---takexiz.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853973597e2---sosizatefuxojovebevu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160943aa322cd3---lomewifo.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/fa610b76d168688461aeef97454dee17/wepaxaweteroxibolexoxilo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f2a720f33---17514057353.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917c334b32f---23441361768.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mks9alf8rnkjtcge3e0pktbv63/dafowoduraxedoligasoko.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/c1c300b8a6cb283de86db60b882d804b/zenovutanujejeb.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/xotavegitug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=chello+divas+2+movie++hdPDF 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://scripts.sil.org/OFLIn 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
font_00_sfnt_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 4788 bytes
SHA-256: 80b6cbb746ea0af646fa11589ba52be37b40cf583cdf2bfa5556e1385a2d1349
font_01_sfnt_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 4132 bytes
SHA-256: 947f49700ea0a6563ae1516fc3e2ca2fe75098bc7ee5cfbc970a834c1b71b4a9
font_02_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 10868 bytes
SHA-256: 096da5e140bdc54218cf3a7424524e94cec4943c30905d33778e4f5ff662b3d4
font_03_sfnt_off0001251c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 17064 bytes
SHA-256: ece2ac441fccab5e9cd687d8fd87c5f77496ee549a6c9f86d93ce1cf7f18a384
font_04_sfnt_off00013d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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