Malicious PDF — malware analysis report

Static analysis result for SHA-256 f635260a21f83215…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 22:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2239c0f855f57ec9f7438d5c96557420 SHA-1: 3d16527c951d893f2766abbedeacfcd7f5138a87 SHA-256: f635260a21f83215399f28c1f8cfda24f09aa77fb50a93f83a1ae0b03c24d982
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains an exploit. The document contains numerous links to compromised websites and a visual download button, suggesting a phishing or malware distribution lure. While no scripts were directly extracted, the PDF structure and heuristic firings point towards exploitation for client execution, potentially involving JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=professional+codeigniter+pdf+download PDF link annotation
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xanonixigasijakamobi.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/poxubiru.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd941d6bb---siferekedutip.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/wedawuvegopikegixuzowe.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/tofogevedinowuxetuju.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/25997694093.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b00dae83b---sanekagufezibugenanuwiniz.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/61337738139.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/7ofdtfse686juemuavm7ltjrdb/xojelelawuledikerazob.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd4042a78---nidivabawekenewi.pdfIn PDF document text
    • http://fastgood4cheap.com/clients/4890/File/4974536475.pdfIn PDF document text
    • http://usmleworkout.com/files/file/nugek.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d248918375---titogofokopuzadodarirav.pdfIn PDF document text
    • http://timapools.com/uploads/files/mogonurasuwutele.pdfIn PDF document text
    • https://hgb.se/filer/file/90257023252.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/89552824140.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1853a0cc9---waxiza.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/68397124564.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8dc1cfc69---xezuzadaxetiwa.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021051353753_559077538.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/2653627327.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8f4933734---71152641144.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/fd393ee281a593238fe26d051fe959d4/denex.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 17528 bytes
SHA-256: 16b4a9b37259abeef4454c9c9ea2da9411029647b971c752f500f358ad48f1ab
font_01_sfnt_off0001129c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB3 10884 bytes
SHA-256: 2dd62ea3d7abfa25fc57b58392f31b6d11fee5c64103e84deeb888226f5aff2b

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