Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a4c9975b0ae5f7…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 13:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9fb9e75a1cd16f40ec2ff668155e5dd SHA-1: 418fef3bee43857f4aa76ff6b2bf9cdde9c172c9 SHA-256: c0a4c9975b0ae5f7b54353a7ccdc1cc0795e924066f2fe6361de0a12affd512d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://acutecardio.ru/sadm_files/fenoriwuvarive.pdf In PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/3416205209.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161419a4ae8b2b---16809761333.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/agogebewodopawar.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/99324510076.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f77ba6e8f1---datupuwigokedovagukipij.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/7664702738.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/gowufameze.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/julob.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614014bee7bce---39606454415.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/xilagigolaborik.pdfIn PDF document text
    • https://tsolisp.com/files/file/53638590076.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/zopuro.pdfIn PDF document text
    • http://rc-modeller.se/images/file///zomekabidulogiwakigu.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/delem.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/nogebazifolemikoruzutijin.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/vajur.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/46421723754.pdfIn PDF document text
    • https://777mto.info/contents/files/22788014897.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/33b1414cec8a91ce84f154379344ce25/bemosabipa.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3161599bd895db0c1a5dd9e67905d305/42525765694.pdfIn PDF document text
    • https://thehouseproduction.net/file/72614696895.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/10832079533.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/4827126649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pavilion+touch+edition+apkPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/81618700385.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_off0000d1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 18124 bytes
SHA-256: 0a37931c17c4f1009125ba8d8a5c7575c26b1268f5e666af27b3458198f04ce6
font_01_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001187b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187B 10600 bytes
SHA-256: e9873af86fe5a664f798371127e8e84d2303795b4fb5ccc3dc54bf63c2b3c5b4