Malicious PDF — malware analysis report

Static analysis result for SHA-256 9826d12ad0ab8255…

MALICIOUS

PDF

92.7 KB Created: 2021-08-06 15:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e56163be2b8b7e947ac2d962e8a3822 SHA-1: 841294c9ad3d98e3728bfb7a820683b3e5854bbf SHA-256: 9826d12ad0ab8255a229a4d37b3c8ac4843676886361619848899805d0f76811
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The primary function appears to be redirecting users to potentially malicious content hosted on these compromised sites.

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://www.juniorcollege.cl/ckfinder/userfiles/files/japudazawoniwaxoranubeveb.pdf In PDF document text
    • http://vyveva.eu/UserFiles/File/wenewevemuzukavemajoliv.pdfIn PDF document text
    • http://kelvista.lt/images/files/tiguxep.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/biwemufudiriburexeku.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e760b0f13---jozawubetonejeduzuzovufop.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/55472516071.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210622193759.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/848288ee2e135dc96465b0531fe517eb/libodalesepumumoba.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052721231179.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/35596465124.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/14276194299.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/d42ni52e4td1ao7h6u21h8s0vt/24238703092.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/kazezozat.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jometebabugo.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/mowepigazunaxukipixalapod.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607968ff256d1---13771973803.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/37406353748.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/29051426733.pdfIn PDF document text
    • https://room12shio4.com/contents//files/medexonikejujebixe.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ab23c309---xufoxojedufepuzuzom.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3546b0f2fb---sevareloxap.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/digagolulozobilokux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+often+do+aldi+staff+get+paidPDF 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_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 18056 bytes
SHA-256: 1e6769c88225fa2c09ab33524cbe5824b160614fbb9cc8dc2f3b3a70e07c751f
font_01_sfnt_off000134bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD6 10652 bytes
SHA-256: 99d9feb3d4622a4f03b9fd770c6952ae3890006167ff34850d0752f25c5bd938

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