Malicious PDF — malware analysis report

Static analysis result for SHA-256 7063b4dce933c2b0…

MALICIOUS

PDF

83.0 KB Created: 2021-08-08 05:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1bb2ebc0589834b73d9db5a68555f0ea SHA-1: 90d0135b8ba6a510a3a7bc8059dd89b9d6152957 SHA-256: 7063b4dce933c2b0488f518c80cee476edc04b54adf80eacfa64c47f3f6efdcc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The embedded URLs suggest an attempt to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160994950b0bae---26248393250.pdf In PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2b16tdkin6kqt7q5hdvnhuq1mu/7626057583.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/36d74faa18ded69335232a08ddcba245/97977995583.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b92017db20---livedivejaxi.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/lazirabasepowas.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/23975370511.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/davibik.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/12262138282.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6ad0b0745---sinusatovulumedo.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/10236075404.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/97d31d973028832abfa8e9dd9805a8cb/xibinutusawa.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9998298912---55683717251.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610336c5ea0fb---tizifuzuwebenugi.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/miwaripajogafane.pdfIn PDF document text
    • https://vestol.bg/files/file/noriremenojunove.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/ripefewixifenutegolalizoj.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3504ee8a48---jupipujavojevonugipok.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4e3360546---34011506215.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/goxoropejumunolevawimugav.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/95240201050.pdfIn PDF document text
    • http://armanetti.com/images/72232553166.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/7039888625.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/l3lhe0rjqk65t5rfi5eko3cbi4/kuwojizegi.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/wosikinir.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16088c01d443a0---12551406272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=manual+book+yamaha+lagenda+110PDF 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_off0000df6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 10852 bytes
SHA-256: 139a30a285816599280d5da298f951e743cdce7b20fe114afeb408a6b442da15
font_01_sfnt_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 17756 bytes
SHA-256: 2d01adcd9f53469fb8ebd1a84cb5346757045a34506b45d676455060046c64a9
font_02_sfnt_off0001269f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1