Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97f66b35e63094d…

MALICIOUS

PDF

79.5 KB Created: 2021-09-03 05:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fd64e20798867679da9bc1538bb168b7 SHA-1: 5f7f5048382a0244503bb613429593f624a6c614 SHA-256: e97f66b35e63094d29057aa28779ea1334ba72e7c6da4485817e8f539b35b5aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://laborke.ru/uplcv?utm_term=frog+skeleton+anatomy+pdf PDF link annotation
    • https://henklinders.nl/henklinders/upload/files/33216079324.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d96c7c482---volemubifam.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/barafe.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/46b6f4f45fe8f9ff3cbd6c4d9460d53a/85032708473.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/36842619450.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/fatalezimogelapat.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/vutigupasexubosix.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce5e5145e6---bososab.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/35bcb9c7901ab14792ed478de9851ea3/67570068215.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/disolibawi.pdfIn PDF document text
    • https://beaszemin.com/files/beridakubadikukowa.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad57f554c0---65679046416.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/76908140685.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c01767878d---ropemezemoludumovokifogu.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/0dvk400k8ai2ardfchcbk40368/vumezubotoderewibisakez.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/turefir.pdfIn PDF document text
    • http://healthywithhart.com/res/file/susotor.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/torasivelewideguwafixalu.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/29987282211.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/12044594693.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/27150449198.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/25513771235.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16081c3b25349d---mazikonodefumup.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_off0000d49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49B 16640 bytes
SHA-256: 0b50c572ed036637806bfc5f7170944a8419f9a3a38bb5b69ab75afb7ad57815
font_01_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 10932 bytes
SHA-256: 02fa0f1a773616f4fcb51c0162a2db2eec852db84c8661d5b069ef2cd299ad5f

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