Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ed0f8a118beead…

MALICIOUS

PDF

88.7 KB Created: 2021-09-10 17:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8601e04f1e469a0f3286ad8d0eae109d SHA-1: 5147ffd508c53b5d732563ca650751d0a4680656 SHA-256: 81ed0f8a118beead9c12c3c57a0cd040f894c7e340f74a908f0c3be50bdf7c40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farms points towards a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161351c92796c4---jeliw.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9ee37d47---61038791060.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/10992053547.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613040b843229---8427822646.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/wofejanuparemanavufes.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed7ccfce3---80580606598.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/wizixogenosapif.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///zumivezebefafid.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/jusawuketawanuxanig.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/t98rhoktmpscmkqf4jutmfrm5u/puduzekiropal.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/safesakusuzorogemugife.pdfIn PDF document text
    • https://sadex.pl/fck/file/fujedavegedoluxopiduma.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/87932087043.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/12338089314.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/wopejisesodoxotivixogetal.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/sawojakubogenujuw.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136f687500e4---kelasimupazusu.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/30664096649.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/bemiranirubefozuwivo.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/1490604596.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/78994821326.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3534419c---vodimolovasub.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/5833582679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=now+you+see+me+1+full+movie+watch+onlinePDF 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_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 17596 bytes
SHA-256: 6ab2f29a85a7a97796d034e494ff30d78bcf21359cc4132a6e17e4f1c40e3fb2
font_01_sfnt_off000123e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E8 10896 bytes
SHA-256: ee38250de1e85003f48d9256476f04737566a43d0387f50cf9446a715598f9d1
font_02_sfnt_off00013d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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