Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaccdd5bd4d419b8…

MALICIOUS

PDF

81.4 KB Created: 2021-10-08 22:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2782f2a6d17ffe6b546050d5ea2328ff SHA-1: 9cf9870fd98e0fc4a38e06cade9f849c917b52b1 SHA-256: aaccdd5bd4d419b890cce1346bcbd20944f25d85ec0580b260ef449c695f5f51
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links are likely intended to lure users to malicious destinations for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9c63d91d0---51439115043.pdf In PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16153a2bbd6d00---50423200227.pdfIn PDF document text
    • https://medpressa.ru/files/file/91482305315.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/pazenekisuvakanokozalawav.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/69020330583.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16143860f519d6---komaxusuzopilemenava.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613962baef0fc---41916992830.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/bawazatawebogubizaxo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd0705ef46---xabibepolixutafibesu.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/rawadedarilodurexomuzeja.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/vezaxasekosumusinif.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/92884441805.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/10/files/211001224556.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/vegogoxagakad.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/63432794195.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/25935482585.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/16827299582.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/19748436502.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/97305998473.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/51007099416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+to+use+instead+of+lime+juicePDF 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_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 10864 bytes
SHA-256: 8297751ecf3dace52db645b7bfa27146dfccbd1f0752d3acfc14664b6c0bebad
font_01_sfnt_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 18904 bytes
SHA-256: e84bae154f6c8f9a2edc67726a4436ee6beb690e3b4f8a9314bf8b059c594dd9