Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac67404e01a6792…

MALICIOUS

PDF

86.6 KB Created: 2021-09-06 12:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 24d4350fabe46435a85c4556793cfe35 SHA-1: 7aac36bc901a3917c94c8bf862a0ed83f55cd0c3 SHA-256: bac67404e01a67929ebcd1d0aca3c96cccbe1e18b65a232ac2e2976aba6adb93
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities to execute malicious code. The heuristics indicate that the PDF acts as a link farm, directing users to multiple compromised WordPress sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smolninskayahotel.com/userfiles/file/nasereporape.pdf In PDF document text
    • http://hoacanh.net/luutru/files/givodevor.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/rijosujasebawabi.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/rasijekadugituvokibunuxu.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/4351647591.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/17603907157.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/72099530835.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/1541db81a14fc139cc7b300de796fc06/pukakelajananamexekegusu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1e95bf429e2e701c26b1994a23f3c19c/10052318354.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdea8c29846---fovuvudebuli.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/38392840594.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/48615456903.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/10806349589.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f687637c4a07677203775445207dd945/44515546824.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/vibotavakevogefukuxaz.pdfIn PDF document text
    • http://erictex.com/ufiles/files/37746086580.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/eaa3d59695593ead1d1146634d83cede/25589355166.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f594bb1030---jugazurupezedikut.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/96617624392.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/70747592835.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/83228729749.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/20241841715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=literatura+griega+historia+pdfPDF 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_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 10684 bytes
SHA-256: 9054ba072ea4865ccc6911edbd20a66122817465bb6130ba7806966a8b52d470
font_01_sfnt_off00010081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 20756 bytes
SHA-256: 3161784db1b4e7bdde7c8d6f13347d9b49b2c39d19ac708245cd42893377140f
font_02_sfnt_off0001351e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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