Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe8655a85d1612d…

MALICIOUS

PDF

102.0 KB Created: 2021-08-18 22:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 44a6077311564c9d9a66428153645f54 SHA-1: 3b5469475f969a6fcce5ffa313ec3a36e0224368 SHA-256: bfe8655a85d1612d4f7532e599656b9371492b0085374f7dbb727f1040a71238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings suggests an attempt to obscure the true destination or leverage compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://chcial.ru/uplcv?utm_term=how+to+reset+a+bryant+digital+thermostat PDF link annotation
    • http://xn--9w3b11kh5l.com/ckupload/files/6452707452.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/81404810237.pdfIn PDF document text
    • http://rc-modeller.se/images/file///66483658779.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8e673279f---72566623299.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/76070426220.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/2eo9bh5shopp1upgojgq6cq1kn/pagilaxujewatovedakes.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6db184c3198aad5ecb32ff30f0fe3eec/93701299961.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/maxurobotimepoku.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/degirimikowinodure.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/goxobadata.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/sepapenesidasebenet.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160769ddf81a89---4965195711.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a448870bc62---pulunofajuzibopeselolodas.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/3d203763e50bac23aa100a3c237fd8a0/60361693514.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/64437824842.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/637ca9b6d3eeb308d209258e5978c338/sekazubogubitixedisuta.pdfIn PDF document text
    • http://maxbrio.kr/files/files/netaxexexovikavagewumolu.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116a126e4827---vanekaxarobolive.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/satoliluzawodagesutidenor.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d16aebead1---romuvabu.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/kopuw.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/96087846909.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 19684 bytes
SHA-256: 1c9a23b1de2aeb158bf081013fab7811d13baec02d28590a566f1515eb702957
font_01_sfnt_off00014bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF7 11024 bytes
SHA-256: f423e5f20dbd39b47ae7776b42315b74af6a43d54a7b1c5534738d3641ebdf96
font_02_sfnt_off0001653c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1653C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D49 2700 bytes
SHA-256: 930f960b8b247511dbecafcb2adb0f4529dfb34ff473ba73a7e1459e05e1151c

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