Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d9ebe826ff2fe5…

MALICIOUS

PDF

89.8 KB Created: 2021-08-12 04:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e0f3274fd791a9a8b30cb28e4e52a70f SHA-1: 2fe985306f8f8f1a83f66c880353bf48009c8727 SHA-256: 25d9ebe826ff2fe52c1bf6be3a16452f001e0c273b1131c74bf1f66a689326b5
236 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a malicious lure, including hosting links on compromised CMS platforms and employing a link farm strategy. Heuristics indicate it's a password-protected archive lure and a remote-support tool lure, suggesting the user is prompted to download an archive and then use a remote support tool. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/bjkcu76brhsb3kh0b1ombi1oh1/89332749366.pdf In PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab36cb72792---24757063368.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/fijotudilaloloboxas.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/tufafelukofomagatum.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/86594844625.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/92869729203.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/14655091059.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868e578215a---24744110436.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/gabibes.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/33aa3d6dca0d26027a46d4935aad8967/budomojokenesesekol.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/fsokpho0ovgacprqqgkrld06od/nakutamaxapipamorolef.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/bagawimubepatavotudimuza.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f10644ca07ac4a9680630ecbaa8f13e6/90360542474.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/kemuwepumapinuzapaper.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/porivinuwetiwaropep.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/61950744158.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5d2c8ebd3---20190059883.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/jixodenusafigefaxudirizu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/14724987140.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1d684120c---jizepobupitezasola.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/7949d0ed211f03b19061cbe68a835299/jisefode.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6e7c2709e26270cccab5cda62b4a2a93/zezip.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/xetosazomoxepito.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/viropis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=english+grammar+check+app+for+androidPDF 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_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 18096 bytes
SHA-256: 69a64443bcf01d3d0e7046fe8550b6905d247a41389f670d6261b9f0b3d3a887
font_02_sfnt_off00013f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F43 11044 bytes
SHA-256: ec8e0d5a574fc5efa9e429bad616ab6aa55705cfe9387a7288342c6cc017c9a9

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