Malicious PDF — malware analysis report

Static analysis result for SHA-256 261d94894936948d…

MALICIOUS

PDF

84.6 KB Created: 2021-07-18 00:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 75891b24d180a243ff7567ac7390ed80 SHA-1: e70cf7dbe7cd1c3b83fe21a5ad04a1b34c756efd SHA-256: 261d94894936948d4bd061bf0088610f787e3c1792589330c133222b6337c0cd
154 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a link farm with multiple URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious or phishing content. The presence of these links and the overall structure indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7439

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/5ad096180ae9234417227942f215e111/rivasiwopariguj.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609af4fc4ee87---46968172022.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/1499ae4a6c863790795f52ea9319b7f0/26598980507.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f3f8ebf18---11489497549.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/zibinixenumiwigeb.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4206lg793peplmcl9rn5rkd9ea/jibipudozozefe.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/a112d6c0b9ff6d6287c225f411f502d4/77801463552.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/l4l6vjs3ggdr8f7ast7a2a8oh5/48954854091.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/48253341982.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/xupelijiriwotowewe.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/sogipofujoladinebeveba.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c7d2577c4---92423159610.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7eaa75588---xijadu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609171f511291---47586087925.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/60749965753.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/lasug.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860cd44bf2e---xijowebela.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/nibojimewode.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd270b6eda---pisefezorepowaguzu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac63f16ed7c---60413600086.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/09bfd6ff2b475affcf9d384df54843a5/39938141009.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc89b96ea---xorisavowom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=circles+class+10+mcq+with+answersPDF link annotation
    • 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_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 10812 bytes
SHA-256: cfd0c970cf4b06e64fca73799e52cec0dc3cbd16cb3593e0d6eb0b3d22536f4d
font_01_sfnt_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c