Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a544bcaef36a53…

MALICIOUS

PDF

86.8 KB Created: 2021-08-26 10:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c3af5324847be7bf668b9bac77e0eee SHA-1: 63c9625c0f9a5df75ee19ee3498f28305962b1e4 SHA-256: 11a544bcaef36a53218938b728f8e0899381f6444dd2df68c3774e00c59417dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/tpqhq4hr2st2qfht4jh95dpv5j/50554331286.pdf In PDF document text
    • https://blokhol.com/upload/files/68032120893.pdfIn PDF document text
    • http://tipiland.net/upload/file/68377332575.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe8285d99---pilofewixaxejunaxubumabo.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9cd7d7a14---7704582014.pdfIn PDF document text
    • https://siroyensao.com/upload/files/potemomidobokib.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3d862afd6181561d578a46401994d34e/23511811791.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1627193861f3f2c1553e649403426d.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/93358917099.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/d73df0d8d194498731fd6530b9cd1295/65320477476.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/monasasovejigelusamu.pdfIn PDF document text
    • http://camonetinternational.com/files/file/mukisumijekusazakoxaned.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/vesifamamupuji.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f98f1c8be8---buwopewepeduzepesux.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/56588214097.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/32c7a8133217cb501517bea40c07e9de/92562665624.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/36385764678.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d3a49a08c---4690325630.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/85651693945.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a19507fcb776fd07a43c4fe357e4a20a/88332831566.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/bokokuxugazexafa.pdfIn PDF document text
    • http://praguetransfer.com/files/file/30667794002.pdfIn PDF document text
    • http://effektfilm.de/files/file/6683564829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hotel+receptionist+answering+phone+calls+scriptPDF 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_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 17032 bytes
SHA-256: 65e48ae981e2d5af6da0f06773487e385f437d62d1485cd5d06f3d5d9e6ee710
font_01_sfnt_off00011c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 10728 bytes
SHA-256: 67692720bcd98e5b4b62fae820e04046b21f12795cd7ac7a5acac67a3082a2a0
font_02_sfnt_off000134b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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