Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3d0ed90fb16e73…

MALICIOUS

PDF

90.3 KB Created: 2021-07-22 16:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7397a9f7096249f912cb93b2300a78f6 SHA-1: 2c34fb5fe84c6409ae786ee25975dfbdc3656062 SHA-256: dc3d0ed90fb16e73c91db6339bfd5ffa37ea347f8918b44896e02f047d1cdcb1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://hpmcfamilyreunion1968.com/clients/83891/File/nuxazilubemofula.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609494f2065ab---kanidujuzujipudapufo.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/9624f7a6d27cb3d1e663b0a4d5489efc/ledokulojegawir.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/8pc2idfg00qlnt7h9rlvr1aqcb/zuxilaxiwesunuratanogabe.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/ritaredibusavoriperas.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/feged.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b92b34c9e---vuvimiwoxepozeregefafuzu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f525cd503c51c22ae364b0864aa773de/sapovirizu.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/busaxatutawulob.pdfIn PDF document text
    • http://standdominica.org/files/files/62796106742.pdfIn PDF document text
    • http://195exim.com/datas/files/letasus.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/7459098596.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd1c06a7d4---66342061387.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/wosafetud.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/22851459684.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b52c7baac---38636081256.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2568d6ba03a9a0fd1c6ac2ebef2b8521/20496339788.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a284d344930---xefelez.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/62669434626.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c69902045a---wigurejozezokefebejupej.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/71dt10ib658soje4g4l0oi1h1m/52114576971.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/jr6g95d5ljnj2m91am89372a24/1164650495.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/pilexafowagefe.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/30965634203.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/17071981976097b09775320.pdfIn PDF document text
    • https://777mto.com/contents//files/98269468284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=acknowledgement+about+work+immersionPDF 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_off0000f8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 18320 bytes
SHA-256: 0631a9dff6e3a434065526fdfc621f6ba5e0f99dbca77effae4f1e29170fbe03
font_01_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 11112 bytes
SHA-256: 1b571083bcd134e81771f4b1fdd67bca42335e828aa2c51dbceae7eafbc34216
font_02_sfnt_off000141a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1