Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e8c2a0b075e5af…

MALICIOUS

PDF

90.2 KB Created: 2021-09-20 12:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a496a9d697488a1f0d15c2537a0de566 SHA-1: 63f7067b271d0520b05d8afd9111908fc6bf779a SHA-256: d0e8c2a0b075e5afad84495b52e075fc5b4e023df8d9b59fe00a8c7addcabf50
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to distribute further malicious content. The primary attack pattern involves luring users to click on these links, which are hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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
  • 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://3qlohas.com/CKEdit/upload/files/11367417927.pdf In PDF document text
    • https://dlt-nkp.com/fileupload/file/xusexusegafozujakukog.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448ec532af7---wufowimovavonara.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/pexugapobovuzaxor.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/30638340387.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/67348226665.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/bamuvetudimovibikuwawet.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/vitaranusezexal.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161456349e8e00---kujejifajibad.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/wofarew.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/rubazujijobumibefo.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/67622621172.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/29353204755.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/30490019691.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/bifugegobu.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/madokotatotej.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161389ca4db784---wovekuzesorafusokela.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/56360303373.pdfIn PDF document text
    • https://fototipia.hu/files/files/zibijuvugew.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/mutisekevebakexawegu.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/xebilejof.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/44680972404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=vcs+in+android+studioPDF 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_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3A 20476 bytes
SHA-256: b7ae8d62ad8b1c9441a9a3f174247d3a46f96b18fe691a5aae25800c7307e5d1
font_02_sfnt_off000143ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CA 10252 bytes
SHA-256: 19e577c6fcd3c87ffd492beff9ee9bbb331b34f945045c6b4224e2c5dbd31592