Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb846ce0a3df3bf7…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 01:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9bd29f9b01b595101f2836edf75eea2 SHA-1: 5e47629fbb7c7bf227706549418aabb9c336b72a SHA-256: cb846ce0a3df3bf7e7dddbf6072fef8c81a15cca792dad1a522f8f27ae087104
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload. The presence of embedded JavaScript (T1059.007) is a key indicator of the execution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • 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.
  • 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 http://tongrentangthai.com/UserFiles/file/68957710231.pdf In PDF document text
    • https://izr.fr/files/34730449645.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/bojopirun.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbe211374---lotuvavipavuv.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/rojimag.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/9173347135.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/2139555267.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/38169854648.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/k0ibpktumb0g68tldsubq78a07/mezinozomox.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/wavenovomidikosif.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/41058075653.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea96a3760---43781071315.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec3a46413---wanakinedatuxefomonazim.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/numijirutavid.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/dodedepivekemodu.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/12185501930.pdfIn PDF document text
    • http://askort.pl/Upload/file/lekikinupoga.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/xodusepu.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/57511672337.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/90475044002.pdfIn PDF document text
    • https://protum.se/file/87980498407.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/fajefupuxored.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/69047046879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+lost+herondale+pdf+downloadPDF 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_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 10552 bytes
SHA-256: 5055ff77bb1746d345e8e03a795902b49b785f462a9bcb7fea03742e9dc3fe69
font_01_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 17632 bytes
SHA-256: e89f03491998d030c627521157db1e7e547f6970f9b3710385eb8dd624b0b227

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