Malicious PDF — malware analysis report

Static analysis result for SHA-256 09919f552423b331…

MALICIOUS

PDF

109.3 KB Created: 2021-06-29 00:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4d9d408556160c97374c90d986d3150a SHA-1: e76d832a15a709c82e86881e17e43bc8753978c0 SHA-256: 09919f552423b3316d46550d23bdf1053b616a1cd2d8a682ecbfeffb11adb85a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or lead users to phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba873cf26---kokimanusozirazap.pdf In PDF document text
    • http://anhbanglaw.com/userfiles/file/gavodugalegegajituf.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6a5eda1b6---9420315904.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/88306600779.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a4e7ff40---vinofi.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bupowivuzubogagakadonanut.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24d6a6c9a3---19673448892.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/99886075037.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160876da0acecd---rizakunuvesonuzejop.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/529a8783c7db63818700dc7a23dd4ae0/67057620512.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/nelawuxazurolezekanaj.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/diwejudamed.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/kuvezupukurazofo.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/1802fbd76f00d2021af41ba74b3f49dd/42003351838.pdfIn PDF document text
    • http://balone.net/_upload/file///43751740769.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607397d06771b---viravo.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/83392260201.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/wovusasewop.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/31451436014.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/jp0k7k1i1ae3rendj48ui770ls/sunuzuvuze.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/7fc163a596bdccd6aa02e01b44ec9cc0/52330063926.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/fm81f9uu3prkvm24er3hk2g1p6/rezijadixixekudazorilodur.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608470edeb9a9---vefimedanivaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=determination+of+moisture+content+of+soil+lab+report+conclusionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF2 10884 bytes
SHA-256: f9ab8977622f240555b2ecffa0c734162ffc3d42bf39466d01798f8c0fe27c7a
font_01_sfnt_off000143e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E0 16360 bytes
SHA-256: ed338080f4e49b75679c3b997b784d6a4780b383df921491a019df5e9c43965a
font_02_sfnt_off00015a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A32 19552 bytes
SHA-256: 345a3416e71e6035f987bda5b2667b6bf26f113295045088765cbaec7106dd69
font_03_sfnt_off00018ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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